accessing-pieces-arrays/slides.tex
author anand
Thu, 11 Nov 2010 00:03:57 +0530
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permissions -rw-r--r--
Checklist OK for `The other kinds of plots`
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% Created 2010-11-02 Tue 17:47
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\documentclass[presentation]{beamer}
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\usepackage[latin1]{inputenc}
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\usepackage[T1]{fontenc}
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\usepackage{fixltx2e}
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\usepackage{graphicx}
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\usepackage{longtable}
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\usepackage{float}
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\usepackage{wrapfig}
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\usepackage{soul}
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\usepackage{textcomp}
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\usepackage{marvosym}
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\usepackage{wasysym}
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\usepackage{latexsym}
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\usepackage{amssymb}
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\usepackage{hyperref}
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\tolerance=1000
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\usepackage[english]{babel} \usepackage{ae,aecompl}
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\usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
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\usepackage{listings}
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\lstset{language=Python, basicstyle=\ttfamily\bfseries,
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commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
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showstringspaces=false, keywordstyle=\color{blue}\bfseries}
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\providecommand{\alert}[1]{\textbf{#1}}
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\title{Accessing parts of arrays}
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\author{FOSSEE}
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\date{}
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\usetheme{Antibes}\usecolortheme{lily}\useoutertheme{infolines}\setbeamercovered{transparent}
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\begin{document}
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\maketitle
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\begin{frame}
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\frametitle{Outline}
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\label{sec-1}
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\begin{itemize}
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\item Manipulating one and multi dimensional arrays
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\item Access and change individual elements
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\item Access and change rows and columns
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\item Slicing and striding on arrays to access chunks
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\item Read images into arrays and manipulations
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Sample Arrays}
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\label{sec-2}
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\lstset{language=Python}
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\begin{lstlisting}
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In []: A = array([12, 23, 34, 45, 56])
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In []: C = array([[11, 12, 13, 14, 15],
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                  [21, 22, 23, 24, 25],
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                  [31, 32, 33, 34, 35],
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                  [41, 42, 43, 44, 45],
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                  [51, 52, 53, 54, 55]])
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{Question 1}
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\label{sec-3}
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  Change the last column of \texttt{C} to zeroes. 
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Solution 1}
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\label{sec-4}
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\lstset{language=Python}
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\begin{lstlisting}
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In []:  C[:, -1] = 0
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{Question 2}
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\label{sec-5}
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  Change \texttt{A} to \texttt{[11, 12, 13, 14, 15]}. 
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Solution 2}
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\label{sec-6}
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\lstset{language=Python}
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\begin{lstlisting}
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In []:  A[:] = [11, 12, 13, 14, 15]
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{squares.png}
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\label{sec-7}
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    \begin{center}
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      \includegraphics[scale=0.6]{squares}    
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    \end{center}
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\end{frame}
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\begin{frame}
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\frametitle{Question 3}
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\label{sec-8}
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\begin{itemize}
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\item obtain \texttt{[22, 23]} from \texttt{C}.
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\item obtain \texttt{[11, 21, 31, 41]} from \texttt{C}.
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\item obtain \texttt{[21, 31, 41, 0]}.
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Solution 3}
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\label{sec-9}
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\lstset{language=Python}
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\begin{lstlisting}
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In []:  C[1, 1:3]
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In []:  C[0:4, 0]
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In []:  C[1:5, 0]
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{Question 4}
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\label{sec-10}
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  Obtain \texttt{[[23, 24], [33, -34]]} from \texttt{C}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Solution 4}
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\label{sec-11}
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\lstset{language=Python}
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\begin{lstlisting}
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In []:  C[1:3, 2:4]
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{Question 5}
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\label{sec-12}
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  Obtain the square in the center of the image
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Solution 5}
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\label{sec-13}
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\lstset{language=Python}
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\begin{lstlisting}
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In []: imshow(I[75:225, 75:225])
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Question 6}
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\label{sec-14}
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  Obtain the following
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\lstset{language=Python}
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\begin{lstlisting}
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[[12, 0], [42, 0]]
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[[12, 13, 14], [0, 0, 0]]
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Solution 6}
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\label{sec-15}
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\lstset{language=Python}
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\begin{lstlisting}
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In []: C[::3, 1::3]
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In []: C[::4, 1:4]
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{Summary}
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\label{sec-16}
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  You should now be able to --
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\begin{itemize}
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\item Manipulate single \& multi dimensional arrays
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\begin{itemize}
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\item Access and change individual elements
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\item Access and change rows and columns
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\item Slice and stride on arrays
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\end{itemize}
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\item Read images into arrays and manipulate them.
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Thank you!}
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\label{sec-17}
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217
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  \begin{block}{}
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  \begin{center}
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  This spoken tutorial has been produced by the
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  \textcolor{blue}{FOSSEE} team, which is funded by the 
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  \end{center}
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  \begin{center}
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    \textcolor{blue}{National Mission on Education through \\
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      Information \& Communication Technology \\ 
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      MHRD, Govt. of India}.
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  \end{center}  
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  \end{block}
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\end{frame}
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\end{document}