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-% Created 2010-11-07 Sun 15:18
-\documentclass[presentation]{beamer}
-\usepackage[latin1]{inputenc}
-\usepackage[T1]{fontenc}
-\usepackage{fixltx2e}
-\usepackage{graphicx}
-\usepackage{longtable}
-\usepackage{float}
-\usepackage{wrapfig}
-\usepackage{soul}
-\usepackage{t1enc}
-\usepackage{textcomp}
-\usepackage{marvosym}
-\usepackage{wasysym}
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-\usepackage{hyperref}
-\tolerance=1000
-\usepackage[english]{babel} \usepackage{ae,aecompl}
-\usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
-\usepackage{listings}
-\lstset{language=Python, basicstyle=\ttfamily\bfseries,
-commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
-showstringspaces=false, keywordstyle=\color{blue}\bfseries}
-\providecommand{\alert}[1]{\textbf{#1}}
-
-\title{Getting started with arrays}
-\author{FOSSEE}
-\date{}
-
-\usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
-\begin{document}
-
-\maketitle
-
-
-
-
-
-
-
-
-
-\begin{frame}
-\frametitle{Outline}
-\label{sec-1}
-
-\begin{itemize}
-\item Arrays
-
-\begin{itemize}
-\item why arrays over lists
-\end{itemize}
-
-\item Creating arrays
-\item Array operations
-\end{itemize}
-\end{frame}
-\begin{frame}
-\frametitle{Overview of Arrays}
-\label{sec-2}
-
-\begin{itemize}
-\item Arrays are homogeneous data structures.
-
-\begin{itemize}
-\item elements have to the same data type
-\end{itemize}
-
-\item Arrays are faster compared to lists
-
-\begin{itemize}
-\item at least \emph{80-100 times} faster than lists
-\end{itemize}
-
-\end{itemize}
-\end{frame}
-\begin{frame}[fragile]
-\frametitle{Creating Arrays}
-\label{sec-3}
-
-\begin{itemize}
-\item Creating a 1-dimensional array
-\end{itemize}
-
-\begin{verbatim}
- In []: a1 = array([1, 2, 3, 4])
-\end{verbatim}
-
- \texttt{[1, 2, 3, 4]} is a list.
-\end{frame}
-\begin{frame}[fragile]
-\frametitle{Creating two-dimensional array}
-\label{sec-4}
-
-\begin{itemize}
-\item Creating a 2-dimensional array
-\end{itemize}
-
-\begin{verbatim}
- In []: a2 = array([[1,2,3,4],[5,6,7,8]])
-\end{verbatim}
-
- here we convert a list of lists to an array making a 2-d array.
-\begin{itemize}
-\item Easier method of creating array with consecutive elements.
-\end{itemize}
-
-\begin{verbatim}
- In []: ar = arange(1,9)
-\end{verbatim}
-\end{frame}
-\begin{frame}[fragile]
-\frametitle{\texttt{reshape()} method}
-\label{sec-5}
-
-\begin{itemize}
-\item To reshape an array
-\end{itemize}
-
-\begin{verbatim}
- In []: ar.reshape(2, 4)
- In []: ar.reshape(4, 2)
- In []: ar = ar.reshape(2, 4)
-\end{verbatim}
-\end{frame}
-\begin{frame}[fragile]
-\frametitle{Creating \texttt{array} from \texttt{list}.}
-\label{sec-6}
-
-\begin{itemize}
-\item \texttt{array()} method accepts list as argument
-\item Creating a list
-\begin{verbatim}
- In []: l1 = [1, 2, 3, 4]
-\end{verbatim}
-
-\item Creating an array
-\begin{verbatim}
- In []: a3 = array(l1)
-\end{verbatim}
-
-\end{itemize}
-\end{frame}
-\begin{frame}
-\frametitle{Exercise 1}
-\label{sec-7}
-
- Create a 3-dimensional array of the order (2, 2, 4).
-\end{frame}
-\begin{frame}[fragile]
-\frametitle{\texttt{.shape} of array}
-\label{sec-8}
-
-\begin{itemize}
-\item \texttt{.shape}
- To find the shape of the array
-\begin{verbatim}
- In []: a1.shape
-\end{verbatim}
-
-\item \texttt{.shape}
- returns a tuple of shape
-\end{itemize}
-\end{frame}
-\begin{frame}
-\frametitle{Exercise 2}
-\label{sec-9}
-
- Find out the shape of the other arrays(a2, a3, ar) that we have created.
-\end{frame}
-\begin{frame}[fragile]
-\frametitle{Homogeneous data}
-\label{sec-10}
-
-\begin{itemize}
-\item All elements in array should be of same type
-\begin{verbatim}
- In []: a4 = array([1,2,3,'a string'])
-\end{verbatim}
-
-\end{itemize}
-\end{frame}
-\begin{frame}[fragile]
-\frametitle{Implicit type casting}
-\label{sec-11}
-
-\begin{verbatim}
- In []: a4
-\end{verbatim}
-
- All elements are type casted to string type
-\end{frame}
-\begin{frame}
-\frametitle{\texttt{identity()}, \texttt{zeros()} methods}
-\label{sec-12}
-
-\begin{itemize}
-\item \texttt{identity(n)}
- Creates an identity matrix, a square matrix of order (n, n) with diagonal elements 1 and others 0.
-\item \texttt{zeros((m, n))}
- Creates an \texttt{m X n} matrix with all elements 0.
-\end{itemize}
-\end{frame}
-\begin{frame}
-\frametitle{Learning exercise}
-\label{sec-13}
-
-\begin{itemize}
-\item Find out about
-
-\begin{itemize}
-\item \texttt{zeros\_like()}
-\item \texttt{ones()}
-\item \texttt{ones\_like()}
-\end{itemize}
-
-\end{itemize}
-\end{frame}
-\begin{frame}
-\frametitle{Array operations}
-\label{sec-14}
-
-\begin{itemize}
-\item \texttt{a1 * 2}
- returns a new array with all elements of \texttt{a1} multiplied by \texttt{2}.
-
-\begin{itemize}
-\item Similarly \texttt{+}, \texttt{-} \& \texttt{/}.
-\end{itemize}
-
-\item \texttt{a1 + 2}
- returns a new array with all elements of \texttt{a1} summed with \texttt{2}.
-\item \texttt{a1 += 2}
- adds \texttt{2} to all elements of array \texttt{a1}.
-
-\begin{itemize}
-\item Similarly \texttt{-=}, \texttt{*=} \& \texttt{/=}.
-\end{itemize}
-
-\item \texttt{a1 + a2}
- does elements-wise addition.
-
-\begin{itemize}
-\item Similarly \texttt{-}, \texttt{*} \& \texttt{/}.
-\end{itemize}
-
-\item \texttt{a1 * a2}
- does element-wise multiplication
-\end{itemize}
-
-
- \textbf{Note} - array(A) * array(B) does element wise multiplication and not matrix multiplication
-\end{frame}
-\begin{frame}
-\frametitle{Summary}
-\label{sec-15}
-
- In this tutorial we covered,
-\begin{itemize}
-\item Basics of arrays
-\item Creating arrays
-\item Arrays from lists
-\item Basic array operations
-\end{itemize}
-\end{frame}
-\begin{frame}
-\frametitle{Thank you!}
-\label{sec-16}
-
- \begin{block}{}
- \begin{center}
- This spoken tutorial has been produced by the
- \textcolor{blue}{FOSSEE} team, which is funded by the
- \end{center}
- \begin{center}
- \textcolor{blue}{National Mission on Education through \\
- Information \& Communication Technology \\
- MHRD, Govt. of India}.
- \end{center}
- \end{block}
-\end{frame}
-
-\end{document}