day1/session2.tex
author Santosh G. Vattam <vattam.santosh@gmail.com>
Fri, 23 Oct 2009 19:13:37 +0530
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Removed L vs T plotting from session 2 day 1 slides.
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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{split}
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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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% 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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\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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% 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[Plotting using Python]{Plotting experimental data\\}
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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 2}
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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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% 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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%\includeonlyframes{current,current1,current2,current3,current4,current5,current6}
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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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  \titlepage
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\end{frame}
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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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\section{Creating and running scripts}
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\begin{frame}[fragile]
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\frametitle{Python Scripts}
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\begin{itemize}
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\item Let us now put all the commands used in the review problem into a file. 
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\item The following commands of IPython help us do this. 
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\end{itemize}
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\begin{lstlisting}
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  In []: %hist
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  In []: %hist -n
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{Python Scripts\ldots}
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  \begin{itemize}
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    \item Open a new file in an \alert{editor}
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    \item Copy and paste required lines from the output of \typ{\%hist -n}
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    \item Save the file as \typ{first_plot.py}
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  \end{itemize}
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  \begin{itemize}
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  \item run the file in IPython using \typ{\%run first_plot.py}\\
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  \end{itemize}
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\end{frame}
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\section{Plotting Points}
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\begin{frame}[fragile]
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\frametitle{Simple Pendulum - L and T}
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  \begin{itemize}
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    \item Given data of Length and Time-period of a Simple pendulum 
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    \item $T^2 = \frac{4\pi^2}{g}L$\\ \alert{{$L$} and {$T^2$} vary linearly}
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    \item We wish to plot L vs. \alert{$T^2$}
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  \end{itemize}    
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\begin{lstlisting}
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In []: L = [0.1,  0.2,  0.3,  
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            0.4,  0.5,  0.6,  
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            0.7,  0.8,  0.9]
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In []: T = [0.6529, 0.8485, 1.0590, 
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            1.2390, 1.4124, 1.5061, 
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            1.6441, 1.7949, 1.8758]
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Plotting $L$ vs. $T^2$}
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\begin{itemize}
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\item We must square each of the values in T
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\item How to do it?
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\item T is a \kwrd{list} and we use a \kwrd{for} loop to iterate over it
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Plotting $L$ vs $T^2$}
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\begin{lstlisting}
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In []: TSq = []
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In []: for t in T:
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 ....:     TSq.append(t*t)
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In []: plot(L, TSq)
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Out[]: [<matplotlib.lines.Line2D object at 0xa5b05ac>]
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\end{lstlisting}
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\end{frame}
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162
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\begin{frame}[fragile]
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\frametitle{Plotting points}
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\begin{itemize}
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\item But we want to plot points!
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\end{itemize}
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\begin{lstlisting}
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  In []: clf()
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  In []: plot(L, TSq, 'o')
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  Out[]: [<matplotlib.lines.Line2D object at 0xac17e0c>]
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  In []: clf()
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  In []: plot(L, TSq, '.')
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  Out[]: [<matplotlib.lines.Line2D object at 0xac17e0c>]
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Additional Plotting Attributes}
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\begin{itemize}
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  \item \kwrd{'o'} - Dots
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  \item \kwrd{'.'} - Smaller Dots
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  \item \kwrd{'-'} - Lines
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  \item \kwrd{'- -'} - Dashed lines
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\end{itemize}
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\end{frame}
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\begin{frame}{New Concepts}
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  \begin{itemize}
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    \item lists
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    \item \typ{for}
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  \end{itemize}
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\end{frame}
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\section{Lists}
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\begin{frame}[fragile]
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  \frametitle{How to create and use lists?}
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\begin{lstlisting}
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In []: mtlist = [] #Empty List
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158
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In []: lst = [1,2,3,4] 
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In []: lst[0]+lst[1]+lst[-1]
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Out[]: 7
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{List: Slicing}
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list[initial:final:step]
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\begin{lstlisting}
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In []: lst[1:3]  # A slice.
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Out[]: [2, 3]
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In []: lst[1:-1]
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Out[]: [2, 3]
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{List methods}
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\begin{lstlisting}
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In []: lst.append(6)
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In []: lst
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Out[]: [1, 2, 3, 4, 5, 6]
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\end{lstlisting}
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%\inctime{10}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{\texttt{for}}
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Used to iterate over lists\\ Let us look at another example.
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\begin{lstlisting}
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In []: lst = [1,2,3,4,5,6]
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In []: for num in lst:
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 ....:     print num, num*num
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 ....:    
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1 1
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2 4
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3 9
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4 16
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5 25
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6 36
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Reading pendulum.txt}
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\begin{itemize}
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  \item We now wish to repeat the plot using the values from a file
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  \item Given a file containing L vs. T values 
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  \item Column1 - L; Column2 - T  
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  \item Read the file
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  \item Plot points for L vs. $T^2$ 
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Reading pendulum.txt}
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\begin{lstlisting}
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In []: L = []
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In []: T = []
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In []: for line in open('pendulum.txt'):
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  ....     points = line.split()
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  ....     L.append(float(points[0]))
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  ....     T.append(float(points[1]))
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\end{lstlisting}
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\begin{itemize}
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\item We now have two lists L and T
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\item Now, Repeat previous steps for plotting
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\end{itemize}
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\end{frame}
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161
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\begin{frame}[fragile]
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\frametitle{Plotting from pendulum.txt}
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\begin{lstlisting}
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In []: TSq = []
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In []: for t in T:
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 ....:     TSq.append(t*t)
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In []: plot(L, TSq, '.')
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\end{lstlisting}
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\end{frame}
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\begin{frame}{New Concepts}
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  \begin{itemize}
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    \item File handling
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    \item Strings
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    \item Data-type conversion
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  \end{itemize}
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\end{frame}
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161
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\begin{frame}[fragile]
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  \frametitle{Reading files \ldots}
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\typ{In []: for line in open('pendulum.txt'):}
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\begin{itemize}
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\item opening file `pendulum.txt'
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\item iterating through file using variable \typ{line}
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\item \typ{line} is a \kwrd{string} variable
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Strings}
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Anything within ``quotes'' is a string!
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\begin{lstlisting}
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' This is a string '  
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" This too! "
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""" This one too! """
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''' And one more! '''
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Strings and \typ{split()}}
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  \begin{lstlisting}
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In []: line = 'hello world'
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130
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In []: a.split()
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Out[]: ['hello', 'world']
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  \end{lstlisting}
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This is what happens with \typ{line}
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  \begin{lstlisting}
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In []: line = '1.2000e-01 7.4252e-01'
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161
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In []: line.split()
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Out[]: ['1.2000e-01', '7.4252e-01']
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  \end{lstlisting}
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\end{frame}
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161
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\begin{frame}[fragile]
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\frametitle{Getting floats from strings}
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  \begin{lstlisting}
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In []: type(points[0])
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Out[]: <type 'str'>
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  \end{lstlisting}
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But, we need floating point numbers
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  \begin{lstlisting}
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In []: t = float(point[0])
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In []: type(t)
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Out[]: <type 'float'>
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  \end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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\begin{figure}
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%\includegraphics[width=3.5in]{data/L-Tsq.png}
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\end{figure}
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\vspace{-0.2in}
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Coming up - \alert{Least Square Fit \ldots}
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\end{frame}
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\end{document}