author | Puneeth Chaganti <punchagan@fossee.in> |
Wed, 04 Nov 2009 10:35:53 +0530 | |
changeset 267 | 978d06520462 |
parent 266 | 28d4714a9702 |
child 270 | 0ad8566e98ff |
permissions | -rwxr-xr-x |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%Tutorial slides on Python. |
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% |
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% Author: FOSSEE |
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% Copyright (c) 2009, FOSSEE, IIT Bombay |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\documentclass[14pt,compress]{beamer} |
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%\documentclass[draft]{beamer} |
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%\documentclass[compress,handout]{beamer} |
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%\usepackage{pgfpages} |
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%\pgfpagesuselayout{2 on 1}[a4paper,border shrink=5mm] |
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% Modified from: generic-ornate-15min-45min.de.tex |
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\mode<presentation> |
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{ |
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\usetheme{Warsaw} |
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\useoutertheme{infolines} |
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\setbeamercovered{transparent} |
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} |
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\usepackage[english]{babel} |
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\usepackage[latin1]{inputenc} |
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%\usepackage{times} |
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\usepackage[T1]{fontenc} |
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|
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% Taken from Fernando's slides. |
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\usepackage{ae,aecompl} |
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\usepackage{mathpazo,courier,euler} |
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\usepackage[scaled=.95]{helvet} |
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\usepackage{amsmath} |
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\definecolor{darkgreen}{rgb}{0,0.5,0} |
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\usepackage{listings} |
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\lstset{language=Python, |
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basicstyle=\ttfamily\bfseries, |
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commentstyle=\color{red}\itshape, |
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stringstyle=\color{darkgreen}, |
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showstringspaces=false, |
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keywordstyle=\color{blue}\bfseries} |
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|
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% Macros |
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\setbeamercolor{emphbar}{bg=blue!20, fg=black} |
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\newcommand{\emphbar}[1] |
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{\begin{beamercolorbox}[rounded=true]{emphbar} |
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{#1} |
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\end{beamercolorbox} |
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} |
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\newcounter{time} |
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\setcounter{time}{0} |
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\newcommand{\inctime}[1]{\addtocounter{time}{#1}{\tiny \thetime\ m}} |
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\newcommand{\typ}[1]{\lstinline{#1}} |
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\newcommand{\kwrd}[1]{ \texttt{\textbf{\color{blue}{#1}}} } |
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%%% This is from Fernando's setup. |
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% \usepackage{color} |
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% \definecolor{orange}{cmyk}{0,0.4,0.8,0.2} |
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% % Use and configure listings package for nicely formatted code |
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% \usepackage{listings} |
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% \lstset{ |
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% language=Python, |
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% basicstyle=\small\ttfamily, |
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% commentstyle=\ttfamily\color{blue}, |
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% stringstyle=\ttfamily\color{orange}, |
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% showstringspaces=false, |
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% breaklines=true, |
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% postbreak = \space\dots |
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% } |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% Title page |
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\title[ODEs \& Root Finding]{Python for Science and Engg:\\ODEs \& Finding Roots} |
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\author[FOSSEE] {FOSSEE} |
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\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay} |
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\date[] {31, October 2009\\Day 1, Session 6} |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%\pgfdeclareimage[height=0.75cm]{iitmlogo}{iitmlogo} |
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%\logo{\pgfuseimage{iitmlogo}} |
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%% Delete this, if you do not want the table of contents to pop up at |
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%% the beginning of each subsection: |
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\AtBeginSubsection[] |
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{ |
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\begin{frame}<beamer> |
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\frametitle{Outline} |
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\tableofcontents[currentsection,currentsubsection] |
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\end{frame} |
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} |
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\AtBeginSection[] |
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{ |
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\begin{frame}<beamer> |
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\frametitle{Outline} |
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\tableofcontents[currentsection,currentsubsection] |
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\end{frame} |
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} |
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|
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% If you wish to uncover everything in a step-wise fashion, uncomment |
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% the following command: |
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%\beamerdefaultoverlayspecification{<+->} |
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|
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%\includeonlyframes{current,current1,current2,current3,current4,current5,current6} |
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|
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% DOCUMENT STARTS |
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\begin{document} |
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\begin{frame} |
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\maketitle |
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\end{frame} |
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|
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%% \begin{frame} |
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%% \frametitle{Outline} |
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%% \tableofcontents |
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%% % You might wish to add the option [pausesections] |
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%% \end{frame} |
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|
221
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\section{ODEs} |
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|
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\begin{frame}[fragile] |
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\frametitle{ODE Integration} |
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We shall use the simple ODE of a simple pendulum. |
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\begin{equation*} |
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\ddot{\theta} = -\frac{g}{L}sin(\theta) |
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\end{equation*} |
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\begin{itemize} |
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\item This equation can be written as a system of two first order ODEs |
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\end{itemize} |
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\begin{align} |
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\dot{\theta} &= \omega \\ |
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\dot{\omega} &= -\frac{g}{L}sin(\theta) \\ |
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\text{At}\ t &= 0 : \nonumber \\ |
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\theta = \theta_0(10^o)\quad & \&\quad \omega = 0\ (Initial\ values)\nonumber |
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\end{align} |
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\end{frame} |
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|
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\begin{frame}[fragile] |
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\frametitle{Solving ODEs using SciPy} |
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\begin{itemize} |
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\item We use the \typ{odeint} function from scipy to do the integration |
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\item Define a function as below |
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\end{itemize} |
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\begin{lstlisting} |
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In []: def pend_int(initial, t): |
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.... theta, omega = initial |
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.... g, L = -9.81, 0.2 |
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.... f=[omega, -(g/L)*sin(theta)] |
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.... return f |
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.... |
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\end{lstlisting} |
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159 |
\end{frame} |
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160 |
|
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\begin{frame}[fragile] |
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\frametitle{Solving ODEs using SciPy \ldots} |
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\begin{itemize} |
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\item \typ{t} is the time variable \\ |
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\item \typ{initial} has the initial values |
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166 |
\end{itemize} |
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\begin{lstlisting} |
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In []: t = linspace(0, 10, 101) |
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In []: initial = [10*2*pi/360, 0] |
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170 |
\end{lstlisting} |
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171 |
\end{frame} |
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|
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\begin{frame}[fragile] |
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\frametitle{Solving ODEs using SciPy \ldots} |
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%%\begin{small} |
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\typ{In []: from scipy.integrate import odeint} |
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%%\end{small} |
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178 |
\begin{lstlisting} |
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In []: pend_sol = odeint(pend_int, |
263
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180 |
initial,t) |
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181 |
\end{lstlisting} |
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182 |
\end{frame} |
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183 |
|
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184 |
\section{Finding Roots} |
133
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185 |
|
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186 |
\begin{frame}[fragile] |
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\frametitle{Roots of $f(x)=0$} |
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188 |
\begin{itemize} |
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189 |
\item Roots --- values of $x$ satisfying $f(x)=0$ |
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190 |
\item $f(x)=0$ may have real or complex roots |
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191 |
\item Presently, let's look at real roots |
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192 |
\end{itemize} |
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193 |
\end{frame} |
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194 |
|
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195 |
\begin{frame}[fragile] |
258
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196 |
\frametitle{Roots of $f(x)=0$} |
133
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197 |
\begin{itemize} |
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|
198 |
\item Given function $cosx-x^2$ |
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|
199 |
\item First we find \alert{a} root in $(-\pi/2, \pi/2)$ |
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\item Then we find \alert{all} roots in $(-\pi/2, \pi/2)$ |
133
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201 |
\end{itemize} |
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202 |
\end{frame} |
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203 |
|
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204 |
%% \begin{frame}[fragile] |
258
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205 |
%% \frametitle{Fixed Point Method} |
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206 |
%% \begin{enumerate} |
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207 |
%% \item Convert $f(x)=0$ to the form $x=g(x)$ |
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208 |
%% \item Start with an initial value of $x$ and iterate successively |
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%% \item $x_{n+1}=g(x_n)$ and $x_0$ is our initial guess |
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210 |
%% \item Iterate until $x_{n+1}-x_n \le tolerance$ |
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211 |
%% \end{enumerate} |
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212 |
%% \end{frame} |
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|
213 |
|
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214 |
%% \begin{frame}[fragile] |
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215 |
%% \frametitle{Fixed Point \dots} |
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|
216 |
%% \begin{lstlisting} |
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|
217 |
%% In []: def our_g(x): |
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218 |
%% ....: return sqrt(cos(x)) |
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219 |
%% ....: |
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|
220 |
%% In []: tolerance = 1e-5 |
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221 |
%% In []: while abs(x1-x0)>tolerance: |
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222 |
%% ....: x0 = x1 |
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223 |
%% ....: x1 = our_g(x1) |
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224 |
%% ....: |
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225 |
%% In []: x0 |
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226 |
%% \end{lstlisting} |
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227 |
%% \end{frame} |
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|
228 |
|
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229 |
\begin{frame}[fragile] |
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|
230 |
\frametitle{Bisection Method} |
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|
231 |
\begin{enumerate} |
258
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|
232 |
\item Start with the given interval $(-\pi/2, \pi/2)$ ($(a, b)$) |
133
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|
233 |
\item $f(a)\cdot f(b) < 0$ |
578db74dfea0
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parents:
diff
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|
234 |
\item Bisect the interval. $c = \frac{a+b}{2}$ |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
235 |
\item Change the interval to $(a, c)$ if $f(a)\cdot f(c) < 0$ |
578db74dfea0
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parents:
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|
236 |
\item Else, change the interval to $(c, b)$ |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
237 |
\item Go back to 3 until $(b-a) \le$ tolerance |
578db74dfea0
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parents:
diff
changeset
|
238 |
\end{enumerate} |
258
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parents:
244
diff
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|
239 |
\alert{\typ{tolerance = 1e-5}} |
133
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parents:
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|
240 |
\end{frame} |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
241 |
|
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
242 |
%% \begin{frame}[fragile] |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
243 |
%% \frametitle{Bisection \dots} |
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
244 |
%% \begin{lstlisting} |
578db74dfea0
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parents:
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|
245 |
%% In []: tolerance = 1e-5 |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
246 |
%% In []: a = -pi/2 |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
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|
247 |
%% In []: b = 0 |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
248 |
%% In []: while b-a > tolerance: |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
249 |
%% ....: c = (a+b)/2 |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
250 |
%% ....: if our_f(a)*our_f(c) < 0: |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
251 |
%% ....: b = c |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
252 |
%% ....: else: |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
253 |
%% ....: a = c |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
254 |
%% ....: |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
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|
255 |
%% \end{lstlisting} |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
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|
256 |
%% \end{frame} |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
257 |
|
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
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|
258 |
\begin{frame}[fragile] |
244
f4f3b36a9fba
Minor edits to day1 sessions 5 and 6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
240
diff
changeset
|
259 |
\frametitle{Newton-Raphson Method} |
133
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
260 |
\begin{enumerate} |
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parents:
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|
261 |
\item Start with an initial guess of x for the root |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
262 |
\item $\Delta x = -f(x)/f^{'}(x)$ |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
263 |
\item $ x \leftarrow x + \Delta x$ |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
264 |
\item Go back to 2 until $|\Delta x| \le$ tolerance |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
265 |
\end{enumerate} |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
266 |
\end{frame} |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
267 |
|
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
268 |
%% \begin{frame}[fragile] |
244
f4f3b36a9fba
Minor edits to day1 sessions 5 and 6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
240
diff
changeset
|
269 |
%% \frametitle{Newton-Raphson \dots} |
133
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
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|
270 |
%% \begin{lstlisting} |
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parents:
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|
271 |
%% In []: def our_df(x): |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
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|
272 |
%% ....: return -sin(x)-2*x |
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Puneeth Chaganti <punchagan@fossee.in>
parents:
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|
273 |
%% ....: |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
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|
274 |
%% In []: delx = 10*tolerance |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
275 |
%% In []: while delx > tolerance: |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
276 |
%% ....: delx = -our_f(x)/our_df(x) |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
277 |
%% ....: x = x + delx |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
278 |
%% ....: |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
279 |
%% ....: |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
280 |
%% \end{lstlisting} |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
281 |
%% \end{frame} |
578db74dfea0
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Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
282 |
|
258
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
283 |
%% \begin{frame}[fragile] |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
284 |
%% \frametitle{Newton-Raphson \ldots} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
285 |
%% \begin{itemize} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
286 |
%% \item What if $f^{'}(x) = 0$? |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
287 |
%% \item Can you write a better version of the Newton-Raphson? |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
288 |
%% \item What if the differential is not easy to calculate? |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
289 |
%% \item Look at Secant Method |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
290 |
%% \end{itemize} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
291 |
%% \end{frame} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
292 |
|
133
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
293 |
\begin{frame}[fragile] |
258
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
294 |
\frametitle{Initial Estimates} |
133
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
295 |
\begin{itemize} |
258
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
296 |
\item Given an interval |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
297 |
\item How to find \alert{all} the roots? |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
298 |
\end{itemize} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
299 |
\begin{enumerate} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
300 |
\item Check for change of signs of $f(x)$ in the given interval |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
301 |
\item A root lies in the interval where the sign change occurs |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
302 |
\end{enumerate} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
303 |
\end{frame} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
304 |
|
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
305 |
\begin{frame}[fragile] |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
306 |
\frametitle{Initial Estimates \ldots} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
307 |
\begin{lstlisting} |
263
8a4a1e5aec85
Changes made for Goa workshop .
Shantanu <shantanu@fossee.in>
parents:
258
diff
changeset
|
308 |
In []: def our_f(x): |
8a4a1e5aec85
Changes made for Goa workshop .
Shantanu <shantanu@fossee.in>
parents:
258
diff
changeset
|
309 |
....: return cos(x) - x*x |
8a4a1e5aec85
Changes made for Goa workshop .
Shantanu <shantanu@fossee.in>
parents:
258
diff
changeset
|
310 |
....: |
8a4a1e5aec85
Changes made for Goa workshop .
Shantanu <shantanu@fossee.in>
parents:
258
diff
changeset
|
311 |
In []: x = linspace(-pi/2, pi/2, 11) |
8a4a1e5aec85
Changes made for Goa workshop .
Shantanu <shantanu@fossee.in>
parents:
258
diff
changeset
|
312 |
In []: y = our_f(x) |
258
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
313 |
\end{lstlisting} |
263
8a4a1e5aec85
Changes made for Goa workshop .
Shantanu <shantanu@fossee.in>
parents:
258
diff
changeset
|
314 |
Get the intervals of x, where sign changes occur |
133
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
315 |
\end{frame} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
316 |
|
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
317 |
\begin{frame}[fragile] |
258
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
318 |
\frametitle{Initial Estimates \ldots} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
319 |
\begin{lstlisting} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
320 |
In []: pos = y[:-1]*y[1:] < 0 |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
321 |
In []: rpos = zeros(x.shape, dtype=bool) |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
322 |
In []: rpos[:-1] = pos |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
323 |
In []: rpos[1:] += pos |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
324 |
In []: rts = x[rpos] |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
325 |
\end{lstlisting} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
326 |
Now use Newton-Raphson? |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
327 |
\end{frame} |
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
328 |
|
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
329 |
|
8d5ac98e3247
Improved Day1 Session6.
Puneeth Chaganti <punchagan@fossee.in>
parents:
244
diff
changeset
|
330 |
\begin{frame}[fragile] |
133
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
331 |
\frametitle{Scipy Methods - \typ{roots}} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
332 |
\begin{itemize} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
333 |
\item Calculates the roots of polynomials |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
334 |
\end{itemize} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
335 |
\begin{lstlisting} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
336 |
In []: coeffs = [1, 6, 13] |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
337 |
In []: roots(coeffs) |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
338 |
\end{lstlisting} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
339 |
\end{frame} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
340 |
|
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
341 |
\begin{frame}[fragile] |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
342 |
\frametitle{Scipy Methods - \typ{fsolve}} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
343 |
\begin{small} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
344 |
\begin{lstlisting} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
345 |
In []: from scipy.optimize import fsolve |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
346 |
\end{lstlisting} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
347 |
\end{small} |
578db74dfea0
Added Day1 Session6 - Finding Roots.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
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348 |
\begin{itemize} |
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\item Finds the roots of a system of non-linear equations |
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\item Input arguments - Function and initial estimate |
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\item Returns the solution |
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\end{itemize} |
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\begin{lstlisting} |
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In []: fsolve(our_f, -pi/2) |
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\end{lstlisting} |
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\end{frame} |
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|
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\begin{frame}[fragile] |
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\frametitle{Scipy Methods \dots} |
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\begin{small} |
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\begin{lstlisting} |
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In []: from scipy.optimize import fixed_point |
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|
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In []: from scipy.optimize import bisect |
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|
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In []: from scipy.optimize import newton |
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\end{lstlisting} |
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\end{small} |
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\end{frame} |
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|
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\begin{frame} |
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\frametitle{Things we have learned} |
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\begin{itemize} |
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\item Solving ODEs |
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\item Finding Roots |
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\begin{itemize} |
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\item Estimating Interval |
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\item Newton-Raphson |
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\item Scipy methods |
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\end{itemize} |
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\end{itemize} |
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\end{frame} |
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|
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\end{document} |