getting-started-with-arrays/slides.tex
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% Created 2010-10-12 Tue 00:20
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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{t1enc}
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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{Getting started with arrays}
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\author{FOSSEE}
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\date{}
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\usetheme{Warsaw}\usecolortheme{default}\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 Arrays
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\begin{itemize}
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\item why arrays over lists
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\end{itemize}
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\item Creating arrays
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\item Array operations
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Overview of Arrays}
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\label{sec-2}
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\begin{itemize}
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\item Arrays are homogeneous data structures.
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\begin{itemize}
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\item elements have to the same data type
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\end{itemize}
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\item Arrays are faster compared to lists
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\begin{itemize}
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\item at least \emph{80-100 times} faster than lists
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\end{itemize}
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Creating Arrays}
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\label{sec-3}
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\begin{itemize}
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\item Creating a 1-dimensional array
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\end{itemize}
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\begin{verbatim}
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   In []: a1 = array([1, 2, 3, 4])
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\end{verbatim}
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\begin{itemize}
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\item Creating a 2-dimensional array
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\end{itemize}
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\begin{verbatim}
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   In []: a2 = array([[1,2,3,4],[5,6,7,8]])
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\end{verbatim}
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\begin{itemize}
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\item Easier method of creating array with consecutive elements.
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\end{itemize}
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\begin{verbatim}
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   In []: ar = arange(1,9)
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\end{verbatim}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{\texttt{reshape()} method}
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\label{sec-4}
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\begin{itemize}
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\item To reshape an array
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\end{itemize}
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\begin{verbatim}
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   In []: ar.reshape(2, 4)
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   In []: ar.reshape(4, 2)
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   In []: ar = ar.reshape(2, 4)
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\end{verbatim}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Creating \texttt{array} from \texttt{list}.}
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\label{sec-5}
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\begin{itemize}
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\item \texttt{array()} method accepts list as argument
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\item Creating a list
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\begin{verbatim}
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    In []: l1 = [1, 2, 3, 4]
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\end{verbatim}
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\item Creating an array
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\begin{verbatim}
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     In []: a3 = array(l1)
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\end{verbatim}
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Exercise 1}
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\label{sec-6}
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  Create a 3-dimensional array of the order (2, 2, 4).
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{\texttt{.shape} of array}
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\label{sec-7}
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\begin{itemize}
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\item \texttt{.shape}
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    To find the shape of the array
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\begin{verbatim}
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     In []: a1.shape
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\end{verbatim}
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\item \texttt{.shape}
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    returns a tuple of shape
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Exercise 2}
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\label{sec-8}
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  Find out the shape of the other arrays(a2, a3, ar) that we have created.
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Homogeneous data}
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\label{sec-9}
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\begin{itemize}
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\item All elements in array should be of same type
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\begin{verbatim}
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     In []: a4 = array([1,2,3,'a string'])
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\end{verbatim}
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\end{itemize}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Implicit type casting}
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\label{sec-10}
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\begin{verbatim}
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    In []: a4
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\end{verbatim}
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    All elements are type casted to string type
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\end{frame}
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\begin{frame}
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\frametitle{\texttt{identity()}, \texttt{zeros()} methods}
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\label{sec-11}
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\begin{itemize}
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\item \texttt{identity(n)}
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    Creates an identity matrix, a square matrix of order (n, n) with diagonal elements 1 and others 0.
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\item \texttt{zeros((m, n))}
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    Creates an \texttt{m X n} matrix with all elements 0.
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Learning exercise}
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\label{sec-12}
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\begin{itemize}
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\item Find out about
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\begin{itemize}
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\item \texttt{zeros\_like()}
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\item \texttt{ones()}
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\item \texttt{ones\_like()}
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\end{itemize}
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Array operations}
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\label{sec-13}
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\begin{itemize}
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\item \texttt{a1 * 2}
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    returns a new array with all elements of \texttt{a1} multiplied by \texttt{2}.
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\begin{itemize}
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\item Similarly \texttt{+}, \texttt{-} \& \texttt{/}.
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\end{itemize}
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\item \texttt{a1 + 2}
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    returns a new array with all elements of \texttt{a1} summed with \texttt{2}.
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\item \texttt{a1 += 2}
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    adds \texttt{2} to all elements of array \texttt{a1}.
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\begin{itemize}
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\item Similarly \texttt{-=}, \texttt{*=} \& \texttt{/=}.
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\end{itemize}
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\item \texttt{a1 + a2}
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    does elements-wise addition.
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\begin{itemize}
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\item Similarly \texttt{-}, \texttt{*} \& \texttt{/}.
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\end{itemize}
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\item \texttt{a1 * a2}
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    does element-wise multiplication
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\end{itemize}
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  \textbf{Note} - array(A) * array(B) does element wise multiplication and not matrix multiplication
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\end{frame}
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\begin{frame}
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\frametitle{Summary}
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\label{sec-14}
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  In this tutorial we covered,
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\begin{itemize}
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\item Basics of arrays
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\item Creating arrays
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\item Arrays from lists
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\item Basic array operations
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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-15}
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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}