+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−% Tutorial slides on Python.
+
−%
+
−% Author: Prabhu Ramachandran <prabhu at aero.iitb.ac.in>
+
−% Copyright (c) 2005-2009, Prabhu Ramachandran
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−
+
−\documentclass[compress,14pt]{beamer}
+
−% \documentclass[handout]{beamer}
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−% \usepackage{pgfpages}
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−% \pgfpagesuselayout{4 on 1}[a4paper,border, shrink=5mm,landscape]
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−\usepackage{tikz}
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−\newcommand{\hyperlinkmovie}{}
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−%\usepackage{movie15}
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−
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−% Note that in presentation mode 
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−% \paperwidth  364.19536pt
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−% \paperheight 273.14662pt
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−% h/w = 0.888
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−
+
−
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−\mode<presentation>
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−{
+
−  \usetheme{Warsaw}
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−  %\usetheme{Boadilla}
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−  %\usetheme{default}
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−  \useoutertheme{split}
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−  \setbeamercovered{transparent}
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−}
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−
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−% To remove navigation symbols
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−\setbeamertemplate{navigation symbols}{}
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−
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−\usepackage{amsmath}
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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.
+
−\usepackage{ae,aecompl}
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−\usepackage{mathpazo,courier,euler}
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−\usepackage[scaled=.95]{helvet}
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−\usepackage{pgf}
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−
+
−\definecolor{darkgreen}{rgb}{0,0.5,0}
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−
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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,
+
−  keywordstyle=\color{blue}\bfseries}
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−
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−% My Macros
+
−\setbeamercolor{postit}{bg=yellow,fg=black}
+
−\setbeamercolor{emphbar}{bg=blue!20, fg=black}
+
−\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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−%{\centerline{\fcolorbox{gray!50} {blue!10}{
+
−%\begin{minipage}{0.9\linewidth}
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−%    {#1} 
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−%\end{minipage}
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−%    }}}
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−
+
−\newcommand{\myemph}[1]{\structure{\emph{#1}}}
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−\newcommand{\PythonCode}[1]{\lstinline{#1}}
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−
+
−\newcommand{\tvtk}{\texttt{tvtk}}
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−\newcommand{\mlab}{\texttt{mlab}}
+
−
+
−\newcounter{time}
+
−\setcounter{time}{0}
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−\newcommand{\inctime}[1]{\addtocounter{time}{#1}{\vspace*{0.1in}\tiny \thetime\ m}}
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−
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−\newcommand\BackgroundPicture[1]{%
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−  \setbeamertemplate{background}{%
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−      \parbox[c][\paperheight]{\paperwidth}{%
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−      \vfill \hfill
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− \hfill \vfill
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−}}}
+
−
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−% Configuring the theme
+
−%\setbeamercolor{normal text}{fg=white}
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−%\setbeamercolor{background canvas}{bg=black}
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−
+
−
+
−
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−% Title page
+
−\title[]{3D data Vizualization\\ \& \\Test Driven Approach}
+
−
+
−\author[FOSSEE Team] {Asokan Pichai\\Prabhu Ramachandran}
+
−
+
−\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}
+
−\date[] {11, October 2009}
+
−\date[] % (optional)
+
−}
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−
+
−%\pgfdeclareimage[height=0.75cm]{iitblogo}{iitblogo}
+
−%\logo{\pgfuseimage{iitblogo}}
+
−
+
−\AtBeginSection[]
+
−{
+
−  \begin{frame}<beamer>
+
−    \frametitle{Outline}
+
−      \Large
+
−    \tableofcontents[currentsection,currentsubsection]
+
−  \end{frame}
+
−}
+
−
+
−%% Delete this, if you do not want the table of contents to pop up at
+
−%% the beginning of each subsection:
+
−\AtBeginSubsection[]
+
−{
+
−  \begin{frame}<beamer>
+
−    \frametitle{Outline}
+
−    \tableofcontents[currentsection,currentsubsection]
+
−  \end{frame}
+
−}
+
−
+
−\AtBeginSection[]
+
−{
+
−  \begin{frame}<beamer>
+
−    \frametitle{Outline}
+
−    \tableofcontents[currentsection,currentsubsection]
+
−  \end{frame}
+
−}
+
−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
−% DOCUMENT STARTS
+
−\begin{document}
+
−
+
−\begin{frame}
+
−  \maketitle
+
−\end{frame}
+
−
+
−\begin{frame}
+
−  \frametitle{Outline}
+
−  \Large
+
−  \tableofcontents
+
−  % You might wish to add the option [pausesections]
+
−\end{frame}
+
−
+
−\section{3D Data Visualization}
+
−
+
−\begin{frame}
+
−    \frametitle{What is visualization?}
+
−    \Large
+
−    \begin{center}
+
−    Visual representation of data
+
−    \end{center}
+
−\end{frame}
+
−
+
−\begin{frame}
+
−    \frametitle{3D visualization}
+
−    \Large
+
−    \begin{center}
+
−        Harder but important
+
−    \end{center}
+
−\end{frame}
+
−
+
−\begin{frame}
+
−    \frametitle{Is this Graphics?}
+
−    \Large
+
−    \begin{center}
+
−        Visualization is about data!
+
−    \end{center}
+
−\end{frame}
+
−
+
−\begin{frame}
+
−    \frametitle{Examples: trajectory in space}
+
−    \Large
+
−    \begin{center}
+
−        \pgfimage[width=2.5in]{MEDIA/m2/mlab/plot3d_ex}
+
−    \end{center}
+
−\end{frame}
+
−
+
−\begin{frame}
+
−    \frametitle{Examples: Fire in a room}
+
−    \Large
+
−    \begin{center}
+
−        Demo of data
+
−    \end{center}
+
−\inctime{10}
+
−\end{frame}
+
−
+
−\section{Tools at your disposal:}
+
−
+
−\subsection{mlab}
+
−
+
−\begin{frame}
+
−    {Overview}
+
−    \Large
+
−    \begin{itemize}
+
−        \item Simple
+
−        \item Convenient
+
−        \item Full-featured
+
−    \end{itemize}
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−
+
−    \frametitle{Getting started}
+
−    \myemph{\Large Vanilla:}
+
−    \begin{lstlisting}[language=bash]
+
−        $ ipython -wthread
+
−    \end{lstlisting}
+
−    \myemph{\Large with Pylab:}
+
−    \begin{lstlisting}[language=bash]
+
−        $ ipython -pylab -wthread
+
−    \end{lstlisting}
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Using mlab:}
+
−
+
−    \begin{lstlisting}
+
−>>> from enthought.mayavi import mlab
+
−    \end{lstlisting}
+
−
+
−    \vspace*{0.5in}
+
−
+
−    \myemph{\Large Try these:}
+
−
+
−    \vspace*{0.25in}
+
−
+
−    \begin{lstlisting}
+
−>>> mlab.test_<TAB>
+
−>>> mlab.test_contour3d()
+
−>>> mlab.test_contour3d??
+
−    \end{lstlisting}
+
−\end{frame}
+
−
+
−\begin{frame}
+
−    {Exploring the view}
+
−    \begin{columns}
+
−        \column{0.6\textwidth}
+
−    \pgfimage[width=3in]{MEDIA/m2/contour3d}
+
−        \column{0.4\textwidth}
+
−        \begin{itemize}
+
−            \item Mouse
+
−            \item Keyboard
+
−            \item Toolbar
+
−            \item Mayavi icon(wait for it...) \pgfimage[width=0.2in]{MEDIA/m2/m2_icon}
+
−        \end{itemize}
+
−    \end{columns}
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{\mlab\ plotting functions}
+
−    \begin{columns}
+
−        \column{0.25\textwidth}
+
−        \myemph{\Large 0D data}
+
−        \column{0.5\textwidth}
+
−    \pgfimage[width=2in]{MEDIA/m2/mlab/points3d_ex}
+
−    \end{columns}
+
−
+
−    \begin{lstlisting}
+
−>>> from numpy import *
+
−>>> t = linspace(0, 2*pi, 50)
+
−>>> u = cos(t)*pi
+
−>>> x, y, z = sin(u), cos(u), sin(t)
+
−    \end{lstlisting}
+
−    \emphbar{\PythonCode{>>> mlab.points3d(x, y, z)}}
+
−\end{frame}
+
−
+
−\begin{frame}
+
−  \begin{columns}
+
−        \column{0.25\textwidth}
+
−        \myemph{\Large 1D data}
+
−        \column{0.5\textwidth}
+
−        \pgfimage[width=2.5in]{MEDIA/m2/mlab/plot3d_ex}
+
−  \end{columns}
+
−  \emphbar{\PythonCode{>>> mlab.plot3d(x, y, z, t)}}
+
−
+
−    Plots lines between the points
+
−    
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \begin{columns}
+
−        \column{0.25\textwidth}
+
−        \myemph{\Large 2D data}
+
−        \column{0.5\textwidth}
+
−        \pgfimage[width=2in]{MEDIA/m2/mlab/surf_ex}
+
−    \end{columns}            
+
−    \begin{lstlisting}
+
−>>> x = mgrid[-3:3:100j,-3:3:100j]
+
−>>> z = sin(x*x + y*y)
+
−    \end{lstlisting}
+
−
+
−    \emphbar{\PythonCode{>>> mlab.surf(x, y, z)}}
+
−
+
−    \alert{Assumes the points are rectilinear}
+
−
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \myemph{\Large 2D data: \texttt{mlab.mesh}}
+
−    \vspace*{0.25in}
+
−
+
−    \emphbar{\PythonCode{>>> mlab.mesh(x, y, z)}}
+
−
+
−    \alert{Points needn't be regular}
+
−
+
−    \vspace*{0.25in}
+
−\begin{lstlisting}
+
−>>> phi, theta = numpy.mgrid[0:pi:20j, 
+
−...                         0:2*pi:20j]
+
−>>> x = sin(phi)*cos(theta)
+
−>>> y = sin(phi)*sin(theta)
+
−>>> z = cos(phi)
+
−>>> mlab.mesh(x, y, z, 
+
−...           representation='wireframe')
+
−\end{lstlisting}
+
−
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−
+
−  \begin{columns}
+
−        \column{0.25\textwidth}
+
−        \myemph{\Large 3D data}
+
−        \column{0.5\textwidth}
+
−        \pgfimage[width=1.5in]{MEDIA/m2/mlab/contour3d}\\        
+
−    \end{columns}
+
−\begin{lstlisting}
+
−>>> x, y, z = ogrid[-5:5:64j, 
+
−...                -5:5:64j, 
+
−...                -5:5:64j]
+
−>>> mlab.contour3d(x*x*0.5 + y*y + 
+
−                   z*z*2)
+
−\end{lstlisting}
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−
+
−    \myemph{\Large 3D vector data: \PythonCode{mlab.quiver3d}}
+
−    \vspace*{0.25in}
+
−
+
−    \pgfimage[width=2in]{MEDIA/m2/mlab/quiver3d_ex}\\
+
−    
+
−\begin{lstlisting}
+
−>>> mlab.test_quiver3d()
+
−\end{lstlisting}
+
−
+
−\emphbar{\PythonCode{obj = mlab.quiver3d(x, y, z, u, v, w)}}
+
−\inctime{20}
+
−\end{frame}
+
−
+
−\subsection{Mayavi2.0}
+
−
+
−\begin{frame}
+
−  \frametitle{Introduction to Mayavi}
+
−  \begin{itemize}
+
−  \item Most scientists not interested in details of visualization
+
−  \item Visualization of data files with a nice UI
+
−  \item Interactive visualization of data (think Matlab)
+
−  \item Embedding visualizations in applications
+
−  \item Customization
+
−  \end{itemize}
+
−  \pause
+
−  \begin{block}{The Goal}
+
−      Provide a \alert{flexible} library/app for every one of these needs!
+
−  \end{block}
+
−\end{frame}
+
−
+
−\begin{frame}
+
−    {Overview of features}
+
−      \vspace*{-0.3in}
+
−  \begin{center}    
+
−    \hspace*{-0.2in}\pgfimage[width=5in]{MEDIA/m2/m2_app3_3}
+
−  \end{center}    
+
−\end{frame}
+
−
+
−
+
−\begin{frame}
+
−    \frametitle{Mayavi in applications}
+
−      \vspace*{-0.3in}
+
−  \begin{center}    
+
−    \hspace*{0.2in}\pgfimage[width=4.5in]{MEDIA/m2/m2_envisage}
+
−  \end{center}
+
−\end{frame}
+
−
+
−\begin{frame}
+
−    {Exploring the documentation}
+
−    \begin{center}
+
−    \pgfimage[width=4.5in]{MEDIA/m2/m2_ug_doc}
+
−    \end{center}
+
−\end{frame}
+
−
+
−
+
−\begin{frame}
+
−  \frametitle{Summary}
+
−      \begin{itemize}
+
−          \item \url{http://code.enthought.com/projects/mayavi}
+
−          \item Uses VTK (\url{www.vtk.org})
+
−          \item BSD license
+
−          \item Linux, win32 and Mac OS X
+
−          \item Highly scriptable
+
−          \item Embed in Traits UIs (wxPython and PyQt4)
+
−          \item Envisage Plugins
+
−          \item Debian/Ubuntu/Fedora
+
−          \item \alert{Pythonic}
+
−      \end{itemize}
+
−    
+
−      \inctime{10}
+
−
+
−\end{frame}
+
−
+
−\begin{frame}
+
−    {Getting hands dirty!}
+
−
+
−        \begin{block}{Motivational problem}
+
−        Atmospheric data of temperature over the surface of the earth.
+
−        Let temperature ($T$) vary linearly with height ($z$):
+
−        \begin{center}            
+
−        $T = 288.15 - 6.5z$
+
−        \end{center}
+
−        \end{block}
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Simple solution}
+
−
+
−    \begin{lstlisting}
+
−lat = linspace(-89, 89, 37)
+
−lon = linspace(0, 360, 37)
+
−z = linspace(0, 100, 11)
+
−    \end{lstlisting}
+
−\pause
+
−    \begin{lstlisting}
+
−x, y, z = mgrid[0:360:37j,-89:89:37j,
+
−                0:100:11j]
+
−t = 288.15 - 6.5*z
+
−mlab.contour3d(x, y, z, t)
+
−mlab.outline()
+
−mlab.colorbar()
+
−    \end{lstlisting}
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Exercise: Lorenz equation}
+
−    \begin{columns}
+
−        \column{0.25\textwidth}
+
−        \begin{eqnarray*}
+
−        \frac{d x}{dt} &=& s (y-x)\\
+
−        \frac{d y}{d t} &=& rx -y -xz\\
+
−        \frac{d z}{d t} &=& xy - bz\\
+
−        \end{eqnarray*}
+
−        \column{0.25\textwidth}
+
−        Let $s=10,$
+
−        $r=28,$ 
+
−        $b=8./3.$
+
−    \end{columns}
+
−    \structure{\Large Region of interest}
+
−  \begin{lstlisting}
+
−x, y, z = mgrid[-50:50:20j,-50:50:20j,
+
−                -10:60:20j]
+
−  \end{lstlisting}
+
−\inctime{20}
+
−\end{frame}
+
−
+
−\section{Test Driven Approach}
+
−
+
−\begin{frame}
+
−    \frametitle{Testing code with \typ{nosetests}}
+
−   
+
−    \begin{itemize}
+
−        \item Writing tests is really simple!
+
−
+
−        \item Using nose
+
−
+
−        \item Example!
+
−    \end{itemize}
+
−\end{frame}
+
−
+
−\begin{frame}
+
−    \frametitle{Need of Testing!}
+
−   
+
−    \begin{itemize}
+
−        \item Quality
+
−
+
−        \item Regression
+
−
+
−        \item Documentation
+
−    \end{itemize}
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Nosetest}
+
−  \begin{lstlisting}
+
−def gcd(a, b):
+
−    """Returns gcd of a and b, 
+
−     handles only positive numbers."""
+
−    if a%b == 0: return b
+
−    return gcd(b, a%b)
+
−def lcm(a, b):
+
−    return a*b/gcd(a, b)
+
−
+
−if __name__ == '__main__':
+
−    import nose
+
−    nose.main()
+
−  \end{lstlisting}
+
−\inctime{10}
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Example}
+
−    \begin{block}{Problem Statement:}
+
−      Write a function to check whether a given input
+
−      string is a palindrome.
+
−    \end{block}
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Function: code.py}
+
−\begin{lstlisting}    
+
−def is_palindrome(input_str):
+
−  return input_str == input_str[::-1]
+
−\end{lstlisting}    
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Test for the palindrome: code.py}
+
−\begin{lstlisting}    
+
−from code import is_palindrome
+
−def test_function_normal_words():
+
−  input = "noon"
+
−  assert is_palindrome(input) == True
+
−\end{lstlisting}    
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Running the tests.}
+
−\begin{lstlisting}    
+
−$ nosetests test.py 
+
−.
+
−----------------------------------------------
+
−Ran 1 test in 0.001s
+
−
+
−OK
+
−\end{lstlisting}    
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Exercise: Including new tests.}
+
−\begin{lstlisting}    
+
−def test_function_ignore_cases_words():
+
−  input = "Noon"
+
−  assert is_palindrome(input) == True
+
−\end{lstlisting}
+
−Check
+
−
+
−\PythonCode{$ nosetests test.py} 
+
−
+
−Tweak the code to pass this test.
+
−\end{frame}
+
−
+
−\begin{frame}[fragile]
+
−    \frametitle{Lets write some test!}
+
−\begin{lstlisting}    
+
−#for form of equation y=mx+c
+
−#given m and c for two equation,
+
−#finding the intersection point.
+
−def intersect(m1,c1,m2,c2):
+
−    x = (c2-c1)/(m1-m2)
+
−    y = m1*x+c1
+
−    return (x,y)
+
−\end{lstlisting}
+
−
+
−Create a simple test for this
+
−
+
−function which will make it fail.
+
−
+
−\inctime{15} 
+
−\end{frame}
+
−
+
−\end{document}
+
−