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%Tutorial slides on Python.

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% Author: FOSSEE 

% Copyright (c) 2009, FOSSEE, IIT Bombay

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% Title page

\title[Interactive Plotting]{Python for Science and Engg: Interactive Plotting}

\author[FOSSEE] {FOSSEE}

\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}

\date[] {31, October 2009\\Day 1, Session 1}

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%% Delete this, if you do not want the table of contents to pop up at

%% the beginning of each subsection:

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  \begin{frame}<beamer>

    \frametitle{Outline}

    \tableofcontents[currentsection,currentsubsection]

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  \begin{frame}<beamer>

    \frametitle{Outline}

    \tableofcontents[currentsection,currentsubsection]

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% DOCUMENT STARTS

\begin{document}

\begin{frame}

  \maketitle

\end{frame}

%% \begin{frame}

%%   \frametitle{Outline}

%%   \tableofcontents

%%   % You might wish to add the option [pausesections]

%% \end{frame}

\begin{frame}[fragile]

\frametitle{Starting up...}

\begin{block}{}

\begin{verbatim}

  $ ipython -pylab  

\end{verbatim}

\end{block}

\begin{lstlisting}     

  In []: print "Hello, World!"

  Hello, World!

\end{lstlisting}

Exiting

\begin{lstlisting}     

  In []: ^D(Ctrl-D)

  Do you really want to exit([y]/n)? y

\end{lstlisting}

\end{frame}

\begin{frame}[fragile]

\frametitle{Loops}

Breaking out of loops

\begin{lstlisting}     

  In []: while True:

    ...:     print "Hello, World!"

    ...:     

  Hello, World!

  Hello, World!^C(Ctrl-C)

  ------------------------------------

  KeyboardInterrupt                   

\end{lstlisting}

\end{frame}

\begin{frame}[fragile]

\frametitle{First Plot}

\begin{columns}

    \column{0.25\textwidth}

    \hspace*{-0.5in}

  \includegraphics[height=2in, interpolate=true]{data/firstplot}

    \column{0.8\textwidth}

    \begin{block}{}

\begin{lstlisting}

In []: x = linspace(0, 2*pi, 51)

In []: plot(x, sin(x))

\end{lstlisting}

    \end{block}

\end{columns}

\end{frame}

\begin{frame}[fragile]

\frametitle{Walkthrough}

\begin{block}{\typ{x = linspace(start, stop, num)} }

returns \typ{num} evenly spaced points, in the interval [\typ{start}, \typ{stop}].

\end{block}

\begin{lstlisting}

x[0] = start

x[num - 1] = end

\end{lstlisting}

\vspace*{.35in}

\begin{block}{\typ{plot(x, y)}}

plots \typ{x} and \typ{y} using default line style and color

\end{block}

\end{frame}

\begin{frame}[fragile]

\frametitle{Adding Labels}

\begin{columns}

  \column{0.25\textwidth}

  \hspace*{-0.45in}

  \includegraphics[height=2in, interpolate=true]{data/label}  

  \hspace*{0.5in}

  \column{0.55\textwidth}

  \begin{block}{}

  \small

  \begin{lstlisting}

In []: xlabel('x')

In []: ylabel('sin(x)')

  \end{lstlisting}

  \small

%  \end{lstlisting}

%\typ{xlabel(s)} sets the label of the \typ{x}-axis to \typ{s}

%  \begin{lstlisting}

  \end{block}

%\typ{ylabel(s)} sets the label of the \typ{y}-axis to \typ{s}

\end{columns}

\end{frame}

\begin{frame}[fragile]

\frametitle{Another example}

  \begin{lstlisting}

In []: clf()

#Clears the plot area.

In []: y = linspace(0, 2*pi, 51)

In []: plot(y, sin(2*y))

In []: xlabel('y')

In []: ylabel('sin(2y)')

  \end{lstlisting}

\emphbar{By default plots would be overlaid!}

\end{frame}

\begin{frame}[fragile]

\frametitle{Title and Legends}

\vspace*{-0.15in}

%  \begin{block}{}

%  \small

\begin{lstlisting}

In []: title('Sinusoids')

#Sets the title of the figure

In []: legend(['sin(2y)'])

\end{lstlisting}

%  \small

%  \end{block}

  \vspace*{-0.1in}

  \begin{center}

  \includegraphics[height=2in, interpolate=true]{data/legend}  

  \end{center}

\end{frame}

\begin{frame}[fragile]

\frametitle{Legend Placement}

\begin{block}{}

    \small

\begin{lstlisting}

In []: legend(['sin(2y)'], loc='center')

\end{lstlisting}

\end{block}

\begin{columns}

    \column{0.6\textwidth}

 \includegraphics[height=2in, interpolate=true]{data/position}  

\begin{lstlisting}

'best', 'right', 'center'

\end{lstlisting}

\column{0.45\textwidth}

\vspace{-0.2in}

\begin{lstlisting}

'upper right'     

'upper left'      

'lower left'      

'lower right'     

'center left'     

'center right'    

'lower center'    

'upper center'    

\end{lstlisting}

\end{columns}

\end{frame}

\begin{frame}[fragile]

  \frametitle{For arbitrary location}

\vspace*{-0.1in}

\begin{lstlisting}

In []: legend(['sin(2y)'], loc=(.8,.1)) 

# Specify south-east corner position

\end{lstlisting}

%\vspace*{-0.2in}

\begin{center}

  \includegraphics[height=2in, interpolate=true]{data/loc}  

\end{center}

\end{frame}

\begin{frame}[fragile]

\frametitle{Saving \& Closing}

\begin{lstlisting}

In []: savefig('sin.png')

In []: close()

\end{lstlisting}

\end{frame}

\begin{frame}[fragile]

\frametitle{Plotting separate figures}

\begin{lstlisting}

In []: figure(1)

In []: plot(y, sin(y))

In []: figure(2)

In []: plot(y, cos(y))

In []: figure(1)

In []: title('sin(y)')

In []: close()

In []: close()

\end{lstlisting}

\end{frame}

\begin{frame}[fragile]

\frametitle{Showing it better}

\vspace{-0.15in}

\begin{lstlisting}

In []: plot(y, sin(y), 'g')

In []: clf()

In []: plot(y, sin(y), linewidth=2)

\end{lstlisting}

\vspace*{-0.2in}

\begin{center}

  \includegraphics[height=2.2in, interpolate=true]{data/green}  

\end{center}

\end{frame}

\begin{frame}[fragile]

\frametitle{Annotating}

\vspace*{-0.15in}

\begin{lstlisting}

In []: annotate('local max', 

       xy=(1.5, 1), 

       xytext=(2.5, .8),

       arrowprops=dict(

       shrink=0.05),)

\end{lstlisting}

\vspace*{-0.2in}

\begin{center}

  \includegraphics[height=2in, interpolate=true]{data/annotate}  

\end{center}

\end{frame}

\begin{frame}[fragile]

\frametitle{Axes lengths}

  \begin{lstlisting}

#Get the axes limits

In []: xmin, xmax = xlim() 

In []: ymin, ymax = ylim() 

In []: xmax = 2*pi

#Set the axes limits

In []: xlim(xmin, xmax) 

In []: ylim(ymin, ymax) 

  \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

\frametitle{Review Problem}

\begin{enumerate}

\item Plot x, -x, sin(x), xsin(x) in range $-5\pi$ to $5\pi$

\item Add a legend

\item Annotate the origin

\item Set axis limits to the range of x

\end{enumerate}

\begin{lstlisting}

In []: x=linspace(-5*pi, 5*pi, 501)

In []: plot(x, x, 'b')

In []: plot(x, -x, 'b')

\end{lstlisting}

$\vdots$

\end{frame}

\begin{frame}[fragile]

\frametitle{Review Problem \ldots}

\small{

\begin{lstlisting}

In []: plot(x, sin(x), 'g', linewidth=2)

In []: plot(x, x*sin(x), 'r', linewidth=3)

\end{lstlisting}

\begin{lstlisting}

In []: legend(['x', '-x', 'sin(x)', 'xsin(x)'])

In []: annotate('origin', 

                 xy=(0, 0), 

                 xytext=(0, -7),

                 arrowprops=dict(

                 shrink=0.05))

In []: xlim(5*pi, 5*pi)

In []: ylim(5*pi, 5*pi)

\end{lstlisting}

}

\end{frame}

\begin{frame}

  \frametitle{Things we have learned}

  \begin{itemize}

  \item Creating simple plots.

  \item Adding labels and legends.

  \item Annotating plots.

  \item Changing the looks: size, linewidth

  \end{itemize}

\end{frame}

\begin{frame}[fragile]

  \begin{center}

  End of Session-1\\

  \alert{Don't Close \typ{IPython}}

  \end{center}

\end{frame}

\end{document}