day2/session5.tex
author Puneeth Chaganti <punchagan@fossee.in>
Wed, 04 Nov 2009 10:35:53 +0530
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%Tutorial slides on Python.
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%
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% Author: Prabhu Ramachandran <prabhu at aero.iitb.ac.in>
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% Copyright (c) 2005-2009, Prabhu Ramachandran
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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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% 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]{\texttt{#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[Exercises]{Exercises}
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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[] {1 November, 2009\\Day 2, Session 4}
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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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% 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}{Problem 1.1}
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  The aliquot of a number is defined as: the sum of the \emph{proper} divisors of the number. \\For example: 
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\center{aliquot(12) = 1 + 2 + 3 + 4 + 6 = 16.}\\
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  Write a function that returns the aliquot number of a given number. 
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\end{frame}
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\begin{frame}{Problem 1.2}
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  Pair of numbers (a, b) is said to be \alert{amicable} if aliquot number of a is b and aliquot number of b is a.\\
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  Example: \texttt{220, 284}\\
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  Write a program that prints all four digit amicable pairs.
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\inctime{20}
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\end{frame}
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%% \begin{frame}{Problem 2}
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%%   Given an empty chessboard and one Bishop placed in any s%quare, say (r, c), generate the list of all squares the Bi%shop could move to.
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%% \end{frame}
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\begin{frame}[fragile]
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  \frametitle{Problem Set 2}
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  Given a string like, ``1, 3-7, 12, 15, 18-21'', produce the list \\
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  \begin{lstlisting}
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    [1,3,4,5,6,7,12,15,18,19,20,21]
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  \end{lstlisting}
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\inctime{10}
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\end{frame}
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\begin{frame} 
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  \frametitle{Problem Set 3}
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  \begin{description}
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    \item[3.1] Count word frequencies in a file.
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\end{description}
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\inctime{5}
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{Problem set 4}
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  Central difference
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  \begin{equation*}
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  \frac{sin(x+h)-sin(x-h)}{2h}
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  \end{equation*}
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  \begin{lstlisting}
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  In []: x = linspace(0, 2*pi, 100)
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  In []: y = sin(x)
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  In []: deltax = x[1] - x[0]
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  \end{lstlisting}
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  \pause
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    \begin{enumerate}
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      \item Given this, get the finite difference of sin in the range 0 to 2*pi
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    \end{enumerate}
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\end{frame}
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\begin{frame}
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  \frametitle{Problem Set 5}
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  \begin{itemize}
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      \item[5.1] Write a function that plots any regular n-gon given \typ{n}.
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      \item[5.2] Consider the logistic map, $f(x) = kx(1-x)$, plot it for
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          $k=2.5, 3.5$ and $4$ in the same plot.
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile] 
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\frametitle{Problem Set 5}
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  \begin{columns}
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    \column{0.6\textwidth}
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    \small{
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    \begin{itemize}
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      \item[3] Consider the iteration $x_{n+1} = f(x_n)$ where $f(x) = kx(1-x)$.  Plot the successive iterates of this process as explained below. 
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    \end{itemize}}
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    \column{0.35\textwidth}
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    \hspace*{-0.5in}
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  \includegraphics[height=1.6in, interpolate=true]{data/cobweb}  
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\end{columns}
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\end{frame}
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\begin{frame}
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  \frametitle{Problem Set 5.3}
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  Plot the cobweb plot as follows:
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  \begin{enumerate}
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    \item Start at $(x_0, 0)$ ($\implies$ i=0)
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    \item Draw a line to $(x_i, f(x_i))$
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    \item Set $x_{i+1} = f(x_i)$
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    \item Draw a line to $(x_{i+1}, x_{i+1})$
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    \item $(i\implies i+1)$ 
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    \item Repeat from 2 for as long as you want 
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  \end{enumerate}
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\inctime{20}
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\end{frame}
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\end{document}