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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[] {08 March, 2010\\Day 1, Session 1}

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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}

  \frametitle{Workshop Schedule: Day 1}

  \begin{description}

	\item[Session 1] Mon 09:00--10:00

	\item[Session 2] Mon 10:05--11:05

	\item[Session 3] Mon 11:20--12:20

        \item[Session 4] Mon 12:25--13:25

        \item[Quiz 1] Mon 14:25--14:45

        \item[Exercises] Mon 14:45--15:30

        \item[Session 5] Mon 15:45--16:45

        \item[Quiz 2] Mon 16:50--17:05

  \end{description}

\end{frame}

\begin{frame}

  \frametitle{Workshop Schedule: Day 2}

  \begin{description}

	\item[Session 1] Tue 09:00--10:00

	\item[Session 2] Tue 10:05--11:05

	\item[Session 3] Tue 11:20--12:20

        \item[Session 4] Tue 12:25--13:25

        \item[Quiz 1] Tue 14:25--14:45

        \item[Exercises] Tue 14:45--15:30

        \item[Session 5] Tue 15:45--16:45

  \end{description}

\end{frame}

\section{Checklist}

\begin{frame}

\frametitle{Checklist}

  \begin{enumerate}

    \item IPython

    \item Editor - we recommend \alert{scite}

    \item Data files: 

      \begin{itemize}

      \item \typ{sslc/sslc1.txt}

      \item \typ{pendulum/pendulum.txt}

      \item \typ{motion-plot/pos.txt}

      \item \typ{word-freq/holmes.txt}

      \item \typ{anagrams/anag.txt}

      \end{itemize}

    \item Python scripts: 

      \begin{itemize}

      \item \typ{sslc/sslc_allreg.py}

      \item \typ{sslc/sslc_science.py}

      \end{itemize}

    \item Images

      \begin{itemize}

      \item \typ{lena/lena.png}

      \item \typ{smoothing/smoothing.gif}

      \end{itemize}

  \end{enumerate}

\end{frame}

\begin{frame}

  \frametitle{About the Workshop}

  \begin{block}{Intended Audience}

  \begin{itemize}

       \item Engg., Mathematics and Science teachers.

       \item Interested students from similar streams.

  \end{itemize}

  \end{block}  

  \begin{block}{Goal: Successful participants will be able to}

    \begin{itemize}

      \item Use Python as plotting, computational tool.

      \item Understand how to use Python as a scripting and problem solving language.

      \item Train students for the same.

    \end{itemize}

  \end{block}

\end{frame}

\begin{frame}[fragile]

\frametitle{The Python interpreter \ldots}

\begin{block}{}

\begin{lstlisting}

  $ python

\end{lstlisting} %$

\end{block}

\begin{lstlisting}     

  >>> print "Hello, World!"

  Hello, World!

\end{lstlisting}

Exiting

\begin{lstlisting}     

  >>> ^D(Ctrl-D)

  $

\end{lstlisting} %$

\end{frame}

\section{Starting up Ipython}

\begin{frame}[fragile]

\frametitle{Starting up \ldots}

\begin{block}{}

\begin{lstlisting}

  $ ipython

\end{lstlisting} %$

\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}

An alternative to IPython is bpython

\end{frame}

\section{Ipython with magic}

\begin{frame}[fragile]

\frametitle{Let the magic begin \ldots}

\begin{itemize}

\item \alert{IPython is an improved interpreter}\\

\item \alert{Recommended for Scientific and Computing work}\\

\end{itemize}

\begin{block}{}

\begin{lstlisting}

  $ ipython -pylab  

\end{lstlisting} %$

\end{block}

\end{frame}

\section{Loops}

\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}

\section{Plotting}

\subsection{Drawing plots}

\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{small}

\begin{lstlisting}

In []: x = linspace(0, 2*pi, 50)

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

\end{lstlisting}

    \end{small}

    \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}

%\inctime{10}

\end{frame}

\subsection{Decoration}

\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()

  \end{lstlisting}

\emphbar{Clears the plot area.}

  \begin{lstlisting}

In []: y = linspace(0, 2*pi, 50)

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

In []: xlabel('y')

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

  \end{lstlisting}

\end{frame}

\subsection{More decoration}

\begin{frame}[fragile]

\frametitle{Title and Legends}

\vspace*{-0.15in}

%  \begin{block}{}

%  \small

\begin{lstlisting}

In []: title('Sinusoids')

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}  

\column{0.45\textwidth}

\vspace{-0.2in}

\begin{lstlisting}

'best' 

'right'

'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)) 

%% \end{lstlisting}

%% \emphbar{Specify south-east corner position}

%% %\vspace*{-0.2in}

%% \begin{center}

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

%% \end{center}

%% %\inctime{10}

%% \end{frame}

\begin{frame}[fragile]

\frametitle{Saving \& Closing}

\begin{lstlisting}

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

In []: close()

\end{lstlisting}

Supported formats to store images:

\begin{itemize}

\item png

\item eps - Easy to embed in Latex files

\item emf

\item pdf

\item ps

\item raw

\item rgba

\item svg

\end{itemize}

\end{frame}

\section{Multiple plots}

\begin{frame}[fragile]

\frametitle{Overlaid Plots}

\begin{lstlisting}

In []: clf()

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

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

In []: xlabel('y')

In []: ylabel('f(y)')

In []: legend(['sin(y)', 'cos(y)']) 

\end{lstlisting}

\emphbar{By default plots would be overlaid!}

\end{frame}

\begin{frame}[fragile]

\frametitle{Plotting separate figures}

\begin{lstlisting}

In []: clf()

In []: figure(1)

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

In []: figure(2)

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

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

In []: figure(1)

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

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

In []: close()

In []: close()

\end{lstlisting}

\end{frame}

\begin{frame}[fragile]

\frametitle{Showing it better}

\vspace{-0.15in}

\begin{lstlisting}

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

In []: clf()

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

\end{lstlisting}

\vspace*{-0.2in}

\begin{center}

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

\end{center}

%\inctime{10}

\end{frame}

\begin{frame}[fragile]

\frametitle{Annotating}

\vspace*{-0.15in}

\begin{lstlisting}

In []: annotate('local max', xy=(1.5, 1))

\end{lstlisting}

\vspace*{-0.2in}

\begin{center}

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

\end{center}

\end{frame}

\begin{frame}[fragile]

\frametitle{Getting axes lengths}

  \begin{lstlisting}

In []: orig_xmin, orig_xmax = xlim() 

In []: orig_ymin, orig_ymax = ylim() 

  \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

  \frametitle{Set the axes limits}

  \begin{lstlisting}

In []: up_xmin = orig_xmin

In []: up_xmax = 2*pi

In []: up_ymin = ymin-0.2

In []: up_ymax = ymax+0.2

In []: xlim(up_xmin, up_xmax)

In []: ylim(up_ymin, up_ymax)

  \end{lstlisting}

\end{frame}

\begin{frame}[fragile]

\frametitle{Review Problem}