1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

     1 % Created 2010-10-10 Sun 18:48

     2 %Tutorial slides on Python.

     2 \documentclass[presentation]{beamer}

     3 %

     4 % Author: FOSSEE 

     5 % Copyright (c) 2009, FOSSEE, IIT Bombay

     6 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

     7 

     8 \documentclass[14pt,compress]{beamer}

     9 %\documentclass[draft]{beamer}

    10 %\documentclass[compress,handout]{beamer}

    11 %\usepackage{pgfpages} 

    12 %\pgfpagesuselayout{2 on 1}[a4paper,border shrink=5mm]

    13 

    14 % Modified from: generic-ornate-15min-45min.de.tex

    15 \mode<presentation>

    16 {

    17   \usetheme{Warsaw}

    18   \useoutertheme{infolines}

    19   \setbeamercovered{transparent}

    20 }

    21 

    22 \usepackage[english]{babel}

    26 

     5 \usepackage{fixltx2e}

    27 \usepackage{ae,aecompl}

     6 \usepackage{graphicx}

    28 \usepackage{mathpazo,courier,euler}

     7 \usepackage{longtable}

    29 \usepackage[scaled=.95]{helvet}

     8 \usepackage{float}

    30 

     9 \usepackage{wrapfig}

    31 \definecolor{darkgreen}{rgb}{0,0.5,0}

    10 \usepackage{soul}

    32 

    11 \usepackage{textcomp}

    12 \usepackage{marvosym}

    13 \usepackage{wasysym}

    14 \usepackage{latexsym}

    15 \usepackage{amssymb}

    16 \usepackage{hyperref}

    17 \tolerance=1000

    18 \usepackage[english]{babel} \usepackage{ae,aecompl}

    19 \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}

    34 \lstset{language=Python,

    21 \lstset{language=Python, basicstyle=\ttfamily\bfseries,

    35     basicstyle=\ttfamily\bfseries,

    22 commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},

    36     commentstyle=\color{red}\itshape,

    23 showstringspaces=false, keywordstyle=\color{blue}\bfseries}

    37   stringstyle=\color{darkgreen},

    24 \providecommand{\alert}[1]{\textbf{#1}}

    38   showstringspaces=false,

    25 

    39   keywordstyle=\color{blue}\bfseries}

    26 \title{Accessing parts of arrays}

    40 

    27 \author{FOSSEE}

    41 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    42 % Macros

    43 \setbeamercolor{emphbar}{bg=blue!20, fg=black}

    44 \newcommand{\emphbar}[1]

    45 {\begin{beamercolorbox}[rounded=true]{emphbar} 

    46       {#1}

    47  \end{beamercolorbox}

    48 }

    49 \newcounter{time}

    50 \setcounter{time}{0}

    51 \newcommand{\inctime}[1]{\addtocounter{time}{#1}{\tiny \thetime\ m}}

    52 

    53 \newcommand{\typ}[1]{\lstinline{#1}}

    54 

    55 \newcommand{\kwrd}[1]{ \texttt{\textbf{\color{blue}{#1}}}  }

    56 

    57 % Title page

    58 \title{Your Title Here}

    59 

    60 \author[FOSSEE] {FOSSEE}

    61 

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

    65 % DOCUMENT STARTS

    30 \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}

    68 \begin{frame}

    33 \maketitle

    69   \maketitle

    34 

    70 \end{frame}

    35 

    71 

    36 

    72 \begin{frame}[fragile]

    37 

    73   \frametitle{Outline}

    38 

    74   \begin{itemize}

    39 

    75     \item 

    40 

    76   \end{itemize}

    41 

    77 \end{frame}

    42 

    78 

    43 \begin{frame}

    79 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    44 \frametitle{Outline}

    80 %%              All other slides here.                  %%

    45 \label{sec-1}

    81 %% The same slides will be used in a classroom setting. %% 

    46 

    82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    47 \begin{itemize}

    83 

    48 \item Manipulating one and multi dimensional arrays

    84 \begin{frame}[fragile]

    49 \item Access and change individual elements

    85   \frametitle{Summary}

    50 \item Access and change rows and columns

    86   \begin{itemize}

    51 \item Slicing and striding on arrays to access chunks

    87     \item 

    52 \item Read images into arrays and manipulations

    88   \end{itemize}

    53 \end{itemize}

    89 \end{frame}

    54 \end{frame}

    90 

    55 \begin{frame}[fragile]

    91 \begin{frame}

    56 \frametitle{Sample Arrays}

    92   \frametitle{Thank you!}  

    57 \label{sec-2}

    58 

    59 \lstset{language=Python}

    60 \begin{lstlisting}

    61 In []: A = array([12, 23, 34, 45, 56])

    62 

    63 In []: C = array([[11, 12, 13, 14, 15],

    64                   [21, 22, 23, 24, 25],

    65                   [31, 32, 33, 34, 35],

    66                   [41, 42, 43, 44, 45],

    67                   [51, 52, 53, 54, 55]])

    68 \end{lstlisting}

    69 \end{frame}

    70 \begin{frame}

    71 \frametitle{Question 1}

    72 \label{sec-3}

    73 

    74   Change the last column of \texttt{C} to zeroes. 

    75 \end{frame}

    76 \begin{frame}[fragile]

    77 \frametitle{Solution 1}

    78 \label{sec-4}

    79 

    80 \lstset{language=Python}

    81 \begin{lstlisting}

    82 In []:  C[:, -1] = 0

    83 \end{lstlisting}

    84 \end{frame}

    85 \begin{frame}

    86 \frametitle{Question 2}

    87 \label{sec-5}

    88 

    89   Change \texttt{A} to \texttt{[11, 12, 13, 14, 15]}. 

    90 \end{frame}

    91 \begin{frame}[fragile]

    92 \frametitle{Solution 2}

    93 \label{sec-6}

    94 

    95 \lstset{language=Python}

    96 \begin{lstlisting}

    97 In []:  A[:] = [11, 12, 13, 14, 15]

    98 \end{lstlisting}

    99 \end{frame}

   100 \begin{frame}

   101 \frametitle{squares.png}

   102 \label{sec-7}

   103 

   104     \begin{center}

   105       \includegraphics[scale=0.6]{squares}    

   106     \end{center}

   107 \end{frame}

   108 \begin{frame}

   109 \frametitle{Question 3}

   110 \label{sec-8}

   111 

   112 \begin{itemize}

   113 \item obtain \texttt{[22, 23]} from \texttt{C}.

   114 \item obtain \texttt{[11, 21, 31, 41]} from \texttt{C}.

   115 \item obtain \texttt{[21, 31, 41, 0]}.

   116 \end{itemize}

   117 \end{frame}

   118 \begin{frame}[fragile]

   119 \frametitle{Solution 3}

   120 \label{sec-9}

   121 

   122 \lstset{language=Python}

   123 \begin{lstlisting}

   124 In []:  C[1, 1:3]

   125 In []:  C[0:4, 0]

   126 In []:  C[1:5, 0]

   127 \end{lstlisting}

   128 \end{frame}

   129 \begin{frame}

   130 \frametitle{Question 4}

   131 \label{sec-10}

   132 

   133   Obtain \texttt{[[23, 24], [33, -34]]} from \texttt{C}

   134 \end{frame}

   135 \begin{frame}[fragile]

   136 \frametitle{Solution 4}

   137 \label{sec-11}

   138 

   139 \lstset{language=Python}

   140 \begin{lstlisting}

   141 In []:  C[1:3, 2:4]

   142 \end{lstlisting}

   143 \end{frame}

   144 \begin{frame}

   145 \frametitle{Question 5}

   146 \label{sec-12}

   147 

   148   Obtain the square in the center of the image

   149 \end{frame}

   150 \begin{frame}[fragile]

   151 \frametitle{Solution 5}

   152 \label{sec-13}

   153 

   154 \lstset{language=Python}

   155 \begin{lstlisting}

   156 In []: imshow(I[75:225, 75:225])

   157 \end{lstlisting}

   158 \end{frame}

   159 \begin{frame}[fragile]

   160 \frametitle{Question 6}

   161 \label{sec-14}

   162 

   163   Obtain the following

   164 \lstset{language=Python}

   165 \begin{lstlisting}

   166 [[12, 0], [42, 0]]

   167 [[12, 13, 14], [0, 0, 0]]

   168 \end{lstlisting}

   169 \end{frame}

   170 \begin{frame}[fragile]

   171 \frametitle{Solution 6}

   172 \label{sec-15}

   173 

   174 \lstset{language=Python}

   175 \begin{lstlisting}

   176 In []: C[::3, 1::3]

   177 In []: C[::4, 1:4]

   178 \end{lstlisting}

   179 \end{frame}

   180 \begin{frame}

   181 \frametitle{Summary}

   182 \label{sec-16}

   183 

   184   You should now be able to --

   185 \begin{itemize}

   186 \item Manipulate 1D \& Multi dimensional arrays

   187 

   188 \begin{itemize}

   189 \item Access and change individual elements

   190 \item Access and change rows and columns

   191 \item Slice and stride on arrays

   192 \end{itemize}

   193 

   194 \item Read images into arrays and manipulate them.

   195 \end{itemize}

   196 \end{frame}

   197 \begin{frame}

   198 \frametitle{Thank you!}

   199 \label{sec-17}

   200