accessing-pieces-arrays/slides.tex.orig
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     1 % Created 2010-11-03 Wed 15:37
       
     2 \documentclass[presentation]{beamer}
       
     3 \usetheme{Antibes}\usecolortheme{lily}\useoutertheme{infolines}\setbeamercovered{transparent}
       
     4 \usepackage[latin1]{inputenc}
       
     5 \usepackage[T1]{fontenc}
       
     6 \usepackage{graphicx}
       
     7 \usepackage{longtable}
       
     8 \usepackage{float}
       
     9 \usepackage{wrapfig}
       
    10 \usepackage{soul}
       
    11 \usepackage{amssymb}
       
    12 \usepackage{hyperref}
       
    13 \usepackage[english]{babel} \usepackage{ae,aecompl}
       
    14 \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
       
    15 \usepackage{listings}
       
    16 \lstset{language=Python, basicstyle=\ttfamily\bfseries,
       
    17 commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
       
    18 showstringspaces=false, keywordstyle=\color{blue}\bfseries}
       
    19 
       
    20 \title{Accessing parts of arrays}
       
    21 \author{FOSSEE}
       
    22 \date{}
       
    23 
       
    24 \begin{document}
       
    25 
       
    26 \maketitle
       
    27 
       
    28 
       
    29 
       
    30 
       
    31 
       
    32 
       
    33 
       
    34 
       
    35 
       
    36 \begin{frame}
       
    37 \frametitle{Outline}
       
    38 \label{sec-1}
       
    39 
       
    40 \begin{itemize}
       
    41 \item Manipulating one and multi dimensional arrays
       
    42 \item Access and change individual elements
       
    43 \item Access and change rows and columns
       
    44 \item Slicing and striding on arrays to access chunks
       
    45 \item Read images into arrays and manipulations
       
    46 \end{itemize}
       
    47 \end{frame}
       
    48 \begin{frame}[fragile]
       
    49 \frametitle{Sample Arrays}
       
    50 \label{sec-2}
       
    51 
       
    52 \begin{verbatim}
       
    53 In []: A = array([12, 23, 34, 45, 56])
       
    54 
       
    55 In []: C = array([[11, 12, 13, 14, 15],
       
    56                   [21, 22, 23, 24, 25],
       
    57                   [31, 32, 33, 34, 35],
       
    58                   [41, 42, 43, 44, 45],
       
    59                   [51, 52, 53, 54, 55]])
       
    60 \end{verbatim}
       
    61 \end{frame}
       
    62 \begin{frame}
       
    63 \frametitle{Question 1}
       
    64 \label{sec-3}
       
    65 
       
    66   Change the last column of \texttt{C} to zeroes. 
       
    67 \end{frame}
       
    68 \begin{frame}[fragile]
       
    69 \frametitle{Solution 1}
       
    70 \label{sec-4}
       
    71 
       
    72 \begin{verbatim}
       
    73 In []:  C[:, -1] = 0
       
    74 \end{verbatim}
       
    75 \end{frame}
       
    76 \begin{frame}
       
    77 \frametitle{Question 2}
       
    78 \label{sec-5}
       
    79 
       
    80   Change \texttt{A} to \texttt{[11, 12, 13, 14, 15]}. 
       
    81 \end{frame}
       
    82 \begin{frame}[fragile]
       
    83 \frametitle{Solution 2}
       
    84 \label{sec-6}
       
    85 
       
    86 \begin{verbatim}
       
    87 In []:  A[:] = [11, 12, 13, 14, 15]
       
    88 \end{verbatim}
       
    89 \end{frame}
       
    90 \begin{frame}
       
    91 \frametitle{squares.png}
       
    92 \label{sec-7}
       
    93 
       
    94     \begin{center}
       
    95       \includegraphics[scale=0.6]{squares}    
       
    96     \end{center}
       
    97 \end{frame}
       
    98 \begin{frame}
       
    99 \frametitle{Question 3}
       
   100 \label{sec-8}
       
   101 
       
   102 \begin{itemize}
       
   103 \item obtain \texttt{[22, 23]} from \texttt{C}.
       
   104 \item obtain \texttt{[11, 21, 31, 41]} from \texttt{C}.
       
   105 \item obtain \texttt{[21, 31, 41, 0]}.
       
   106 \end{itemize}
       
   107 \end{frame}
       
   108 \begin{frame}[fragile]
       
   109 \frametitle{Solution 3}
       
   110 \label{sec-9}
       
   111 
       
   112 \begin{verbatim}
       
   113 In []:  C[1, 1:3]
       
   114 In []:  C[0:4, 0]
       
   115 In []:  C[1:5, 0]
       
   116 \end{verbatim}
       
   117 \end{frame}
       
   118 \begin{frame}
       
   119 \frametitle{Question 4}
       
   120 \label{sec-10}
       
   121 
       
   122   Obtain \texttt{[[23, 24], [33, -34]]} from \texttt{C}
       
   123 \end{frame}
       
   124 \begin{frame}[fragile]
       
   125 \frametitle{Solution 4}
       
   126 \label{sec-11}
       
   127 
       
   128 \begin{verbatim}
       
   129 In []:  C[1:3, 2:4]
       
   130 \end{verbatim}
       
   131 \end{frame}
       
   132 \begin{frame}
       
   133 \frametitle{Question 5}
       
   134 \label{sec-12}
       
   135 
       
   136   Obtain the square in the center of the image
       
   137 \end{frame}
       
   138 \begin{frame}[fragile]
       
   139 \frametitle{Solution 5}
       
   140 \label{sec-13}
       
   141 
       
   142 \begin{verbatim}
       
   143 In []: imshow(I[75:225, 75:225])
       
   144 \end{verbatim}
       
   145 \end{frame}
       
   146 \begin{frame}[fragile]
       
   147 \frametitle{Question 6}
       
   148 \label{sec-14}
       
   149 
       
   150   Obtain the following
       
   151 \begin{verbatim}
       
   152 [[12, 0], [42, 0]]
       
   153 [[12, 13, 14], [0, 0, 0]]
       
   154 \end{verbatim}
       
   155 \end{frame}
       
   156 \begin{frame}[fragile]
       
   157 \frametitle{Solution 6}
       
   158 \label{sec-15}
       
   159 
       
   160 \begin{verbatim}
       
   161 In []: C[::3, 1::3]
       
   162 In []: C[::4, 1:4]
       
   163 \end{verbatim}
       
   164 \end{frame}
       
   165 \begin{frame}
       
   166 \frametitle{Summary}
       
   167 \label{sec-16}
       
   168 
       
   169   You should now be able to --
       
   170 \begin{itemize}
       
   171 \item Manipulate single \& multi dimensional arrays
       
   172 
       
   173 \begin{itemize}
       
   174 \item Access and change individual elements
       
   175 \item Access and change rows and columns
       
   176 \item Slice and stride on arrays
       
   177 \end{itemize}
       
   178 
       
   179 \item Read images into arrays and manipulate them.
       
   180 \end{itemize}
       
   181 \end{frame}
       
   182 \begin{frame}
       
   183 \frametitle{Thank you!}
       
   184 \label{sec-17}
       
   185 
       
   186   \begin{block}{}
       
   187   \begin{center}
       
   188   This spoken tutorial has been produced by the
       
   189   \textcolor{blue}{FOSSEE} team, which is funded by the 
       
   190   \end{center}
       
   191   \begin{center}
       
   192     \textcolor{blue}{National Mission on Education through \\
       
   193       Information \& Communication Technology \\ 
       
   194       MHRD, Govt. of India}.
       
   195   \end{center}  
       
   196   \end{block}
       
   197 \end{frame}
       
   198 
       
   199 \end{document}