accessing-pieces-arrays/slides.org
author Puneeth Chaganti <punchagan@fossee.in>
Mon, 01 Nov 2010 21:57:12 +0530
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permissions -rw-r--r--
Changes to accessing pieces of arrays, based on review.
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#+LaTeX_CLASS: beamer
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#+LaTeX_CLASS_OPTIONS: [presentation]
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#+BEAMER_FRAME_LEVEL: 1
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#+BEAMER_HEADER_EXTRA: \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
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#+COLUMNS: %45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra)
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#+PROPERTY: BEAMER_col_ALL 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 :ETC
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#+LaTeX_CLASS: beamer
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#+LaTeX_CLASS_OPTIONS: [presentation]
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#+LaTeX_HEADER: \usepackage[english]{babel} \usepackage{ae,aecompl}
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#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
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#+LaTeX_HEADER: \usepackage{listings}
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#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries,
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#+LaTeX_HEADER:  commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
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#+LaTeX_HEADER:  showstringspaces=false, keywordstyle=\color{blue}\bfseries}
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#+TITLE:    Accessing parts of arrays
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#+AUTHOR:    FOSSEE
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#+EMAIL:     
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#+DATE:    
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#+DESCRIPTION: 
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#+KEYWORDS: 
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#+LANGUAGE:  en
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#+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
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#+OPTIONS:   TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc
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* Outline
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  - Manipulating one and multi dimensional arrays
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  - Access and change individual elements 
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  - Access and change rows and columns 
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  - Slicing and striding on arrays to access chunks 
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  - Read images into arrays and manipulations
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* Sample Arrays
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  #+begin_src python
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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_src
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* Question 1
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  Change the last column of ~C~ to zeroes. 
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* Solution 1
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  #+begin_src python
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    In []:  C[:, -1] = 0
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  #+end_src
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* Question 2
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  Change ~A~ to ~[11, 12, 13, 14, 15]~. 
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* Solution 2
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  #+begin_src python
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    In []:  A[:] = [11, 12, 13, 14, 15]
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  #+end_src
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* squares.png
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  #+begin_latex
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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_latex
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* Question 3
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  - obtain ~[22, 23]~ from ~C~. 
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  - obtain ~[11, 21, 31, 41]~ from ~C~. 
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  - obtain ~[21, 31, 41, 0]~.   
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* Solution 3
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  #+begin_src python
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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_src
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* Question 4
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  Obtain ~[[23, 24], [33, -34]]~ from ~C~
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* Solution 4
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  #+begin_src python
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    In []:  C[1:3, 2:4]
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  #+end_src
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* Question 5
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  Obtain the square in the center of the image
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* Solution 5
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  #+begin_src python
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    In []: imshow(I[75:225, 75:225])
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  #+end_src
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* Question 6
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  Obtain the following
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  #+begin_src python
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    [[12, 0], [42, 0]]
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    [[12, 13, 14], [0, 0, 0]]
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  #+end_src
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* Solution 6
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  #+begin_src python
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    In []: C[::3, 1::3]
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    In []: C[::4, 1:4]
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  #+end_src
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* Summary
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  You should now be able to --
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  - Manipulate single \& multi dimensional arrays
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      - Access and change individual elements 
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      - Access and change rows and columns 
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      - Slice and stride on arrays
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  - Read images into arrays and manipulate them.
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* Thank you!
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#+begin_latex
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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_latex
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