day1/session2.tex
author Shantanu <shantanu@fossee.in>
Mon, 04 Jan 2010 19:54:26 +0530 (2010-01-04)
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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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% 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 with Python]{Python for Science and Engg: 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[] {11 January, 2010\\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{Plotting Points}
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\begin{frame}[fragile]
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\frametitle{Why would I plot f(x)?}
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Do we plot analytical functions or experimental data?
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\begin{small}
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\begin{lstlisting}
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In []: x = [0, 1, 2, 3]
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In []: y = [7, 11, 15, 19]
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In []: plot(x, y)
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Out[]: [<matplotlib.lines.Line2D object at 0xa73aa8c>]
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In []: xlabel('X')
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Out[]: <matplotlib.text.Text object at 0x986e9ac>
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In []: ylabel('Y')
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Out[]: <matplotlib.text.Text object at 0x98746ec>
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\end{lstlisting}
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\end{small}
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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/straightline.png}
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\end{figure}
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\alert{Is this what you have?}
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\end{frame}
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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 What if we want to plot the 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(x, y, 'o')
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  Out[]: [<matplotlib.lines.Line2D object at 0xac17e0c>]
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  In []: clf()
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  In []: plot(x, y, '.')
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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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\begin{figure}
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\includegraphics[width=2in]{data/stline_dots.png}
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\includegraphics[width=2in]{data/stline_points.png}
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\end{figure}
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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'} - Filled circles
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  \item \kwrd{'.'} - Small 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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\section{Lists}
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\begin{frame}[fragile]
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  \frametitle{Lists: Introduction}
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  \begin{lstlisting}
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    In []: x = [0, 1, 2, 3]
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    In []: y = [7, 11, 15, 19]
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  \end{lstlisting}
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What are \typ{x} and \typ{y}?\\
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\begin{center}
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\alert{\typ{lists!!}}
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\end{center}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Lists: Initializing \& accessing elements}
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\begin{lstlisting}
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In []: mtlist = [] 
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\end{lstlisting}
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\emphbar{Empty List}
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\begin{lstlisting}
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In []: a = [ 1, 2, 3, 4, 5] 
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In []: a[0]+a[1]+a[-1]
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Out[]: 8
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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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  \begin{block}{Remember\ldots}
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	\kwrd{In []: a = [ 1, 2, 3, 4, 5]}
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  \end{block}
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\begin{lstlisting}
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In []: a[1:3]
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Out[]: [2, 3]
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\end{lstlisting}
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\emphbar{A slice}
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\begin{lstlisting}
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In []: a[1:-1]
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Out[]: [2, 3, 4]
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\end{lstlisting}
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\alert{\typ{list[initial:final]}}
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\end{frame}
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%% more on list slicing
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\begin{frame}[fragile]
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\frametitle{List operations}
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\begin{lstlisting}
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In []: b = [ 6, 7, 8, 9]
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In []: c = a + b
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In []: c
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Out[]: [1, 2, 3, 4, 5, 6, 7, 8, 9]
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In []: a.append(6)
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In []: a
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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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\section{Simple Pendulum}
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\begin{frame}[fragile]
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\frametitle{Simple Pendulum - L and T}
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Let us look at the Simple Pendulum experiment.
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\begin{center}
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\begin{small}
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\begin{tabular}{| c | c | c |}
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\hline
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$L$ & $T$ & $T^2$ \\ \hline
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0.1 & 0.69 & \\ \hline
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0.2 & 0.90 & \\ \hline
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0.3 & 1.19 & \\ \hline
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0.4 & 1.30 & \\ \hline
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0.5 & 1.47 & \\ \hline
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0.6 & 1.58 & \\ \hline
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0.7 & 1.77 & \\ \hline
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0.8 & 1.83 & \\ \hline
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0.9 & 1.94 & \\ \hline
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\end{tabular}
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\end{small}\\
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\alert{$L \alpha T^2$}
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\end{center}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Lets use lists}
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\begin{lstlisting}
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In []: l = [0.1, 0.2, 0.3, 0.4, 0.5, 
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            0.6, 0.7, 0.8, 0.9]
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In []: t = [0.69, 0.90, 1.19, 
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            1.30, 1.47, 1.58, 
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            1.77, 1.83, 1.94]
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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 \typ{t}
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\item How to do it?
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\item We use a \kwrd{for} loop to iterate over \typ{t}
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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 time in t:
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 ....:     tsq.append(time*time)
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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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This gives \kwrd{tsq} which is the list of squares of \typ{t} values.
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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{How to come out of the \texttt{for} loop?}
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  Hit the ``ENTER'' key twice to come to the previous indentation level
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  \begin{lstlisting}
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    In []: for time in t:
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     ....:     tsq.append(time*time)
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     ....:     
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     ....:     
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    In []: print tsq
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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-limited.png}
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\end{figure}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{What about larger data sets?}
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\alert{Data is usually present in a file!} \\
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Lets look at the \typ{pendulum.txt} file.
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\begin{lstlisting} 
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$ cat pendulum.txt 
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1.0000e-01 6.9004e-01
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1.1000e-01 6.9497e-01
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1.2000e-01 7.4252e-01
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1.3000e-01 7.5360e-01
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1.4000e-01 8.3568e-01
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1.5000e-01 8.6789e-01
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\end{lstlisting}  %$
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\ldots
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\begin{block}{Windows users:}
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  C:> type pendulum.txt
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\end{block}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Reading \typ{pendulum.txt}}
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\begin{itemize}
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  \item Let us generate a plot from the data file
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  \item File contains L vs. T values 
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  \item L - Column1; T - Column2
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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 from \typ{pendulum.txt}}
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Open a new script and type the following:
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\begin{lstlisting}
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l = []
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t = []
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for line in open('pendulum.txt'):
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    point = line.split()
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    l.append(float(point[0]))
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    t.append(float(point[1]))
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tsq = []
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for time in t:
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    tsq.append(time*time)
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plot(l, tsq, '.')
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{Save and run}
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\begin{itemize}
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  \item Save as pendulum\_plot.py.
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  \item Run using \kwrd{\%run -i pendulum\_plot.py}
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\end{itemize}
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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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\end{frame}
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\begin{frame}[fragile]
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  \frametitle{Reading files \ldots}
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\typ{for line in open('pendulum.txt'):}
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\begin{itemize}
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\item opening file `\typ{pendulum.txt}'
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\item reading the file line by line
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\item \typ{line} is a \kwrd{string}
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\end{itemize}
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\end{frame}
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\section{Strings}
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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 []: greet = 'hello world'
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In []: greet.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 = '1.20 7.42'
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301
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In []: point = line.split()
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   424
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In []: point
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Out[]: ['1.20', '7.42']
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  \end{lstlisting}
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\end{frame}
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   429
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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(point[0])
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Out[]: <type 'str'>
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   435
  \end{lstlisting}
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   436
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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   439
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In []: type(t)
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   441
Out[]: <type 'float'>
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   442
  \end{lstlisting}
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   443
\end{frame}
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   444
274
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\begin{frame}[fragile]
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\frametitle{Let's review the code}
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\begin{lstlisting}
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   448
l = []
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t = []
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   450
for line in open('pendulum.txt'):
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   451
    point = line.split()
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   452
    l.append(float(point[0]))
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   453
    t.append(float(point[1]))
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   454
tsq = []
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   455
for time in t:
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   456
    tsq.append(time*time)
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   457
plot(l, tsq, '.')
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   458
\end{lstlisting}
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   459
\end{frame}
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   460
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   461
\begin{frame}[fragile]
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   462
\begin{figure}
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\includegraphics[width=3.5in]{data/L-Tsq.png}
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\end{figure}
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   465
\end{frame}
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   466
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   467
\section {Summary}
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\begin{frame}[fragile]
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   469
\frametitle{What did we learn?}
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\begin{itemize}
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  \item Plotting points
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  \item Plot attributes
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  \item Lists
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  \item \kwrd{for}
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  \item Reading files
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   476
  \item Tokenizing
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  \item Strings
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\end{itemize}
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\end{frame}
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\end{document}