From fe2880ead757a69747618e47b9e91eb7d4fc1eab Mon Sep 17 00:00:00 2001 From: Anoop Jacob Thomas Date: Wed, 10 Nov 2010 17:39:42 +0530 Subject: added script getting started with functions. --- getting-started-with-functions/script.rst | 291 ++++++++++++++++++++++++++++++ 1 file changed, 291 insertions(+) create mode 100644 getting-started-with-functions/script.rst (limited to 'getting-started-with-functions') diff --git a/getting-started-with-functions/script.rst b/getting-started-with-functions/script.rst new file mode 100644 index 0000000..64a53e0 --- /dev/null +++ b/getting-started-with-functions/script.rst @@ -0,0 +1,291 @@ +.. Objectives +.. ---------- + +.. 8.1 LO: getting started with functions (3) + +.. At the end of this tutorial, you will be able to + +.. 1. define function +.. #. define functions with arguments +.. #. learn about docstrings +.. #. learn about return values +.. can return multiple values +.. #. read code + + +.. Prerequisites +.. ------------- + +.. 1. should have ``ipython`` installed. +.. #. getting started with ``ipython``. + + +.. Author : Anoop Jacob Thomas + Internal Reviewer : + External Reviewer : + Checklist OK? : [2010-10-05] + + +============================== +Getting started with functions +============================== + +{{{ show welcome slide }}} + +Hello and welcome to the tutorial getting started with functions. + +{{{ switch to next slide, outline slide }}} + +In this tutorial we will learn about functions in python, how to +define functions, arguments to functions, docstrings, and function +return value. + +{{{ switch to next slide, Function }}} + +While writing code, we always want to reduce the number of lines of +code and functions is a way of reusing the code. Thus the same lines +of code can be used again and again. A function is a portion of code +within a larger program that performs a specific task and is +relatively independent of the remaining code. Now let us get more +familiar with functions, + +{{{ switch to next slide, f(x) a mathematical function }}} + +Consider a mathematical function f(x) = x square. Here x is a variable +and with different values of x the value of function will change. When +x is one f(1) will return the value 1 and f(2) will return us the +value 4. Let us now see how to define the function f(x) in python. + +{{{ switch to next slide, define f(x) in Python }}} + +In your Ipython interpreter type the following, +:: + + def f(x): + return x*x + +Well that defined the function, so before learning what we did let us +see if it returns the expected values, try, +:: + + f(1) + f(2) + +Yes, it returned 1 and 2 respectively. And now let us see what we did, +we wrote two lines. The first line ``def f(x)`` is used to define the +name and the parameters to the function. ``def`` is a keyword and +``f`` is the name of the function and ``x`` the parameter of the +function. + +{{{ switch to next slide, problem statement 1 }}} + +%% 1 %% Write a python function named cube which computes the cube of + a given number n. + +Pause here and try to solve the problem yourself. + +{{{ switch to next slide, solution }}} + +The problem can be solved as, +:: + + def cube(n): + return n**3 + +And now let us see how to write functions without arguments. + +{{{ switch to next slide, greet function }}} + +let us define a new function called ``greet`` which will print ``Hello +World``. +:: + + def greet(): + print "Hello World!" + +now try calling the function, +:: + + greet() + +Well that is a function which takes no arguments. Also note that it is +not mandatory for a function to return values. The function ``greet`` +neither takes any argument nor returns any value. + +Now let us see how to write functions with more than one argument. + +{{{ switch to next slide, exercise 2 }}} + +%% 2 %% Write a python function named ``avg`` which computes the + average of ``a`` and ``b``. + +Pause here and try to solve the problem yourself. + +{{{ switch to next slide, solution 2 }}} + +The problem can be solved as, +:: + + def avg(a,b): + return (a + b)/2 + +Thus if we want a function to accept more arguments, we just list them +separated with a comma between the parenthesis after the function name +in the ``def`` line. + +{{{ switch to next slide, docstring }}} + +It is always a good practice to document the code that we write, and +for a function we define we should write an abstract of what the +function does, and that is called a docstring. Let us modify the +function ``avg`` and add docstring to it. Do the following, +:: + + def avg(a,b): + """ avg takes two numbers as input (a & b), and + returns the average of a and b""" + return (a+b)/2 + +Note that docstrings are entered in the immediate line after the +function definition and put as a triple quoted string. And here as far +as the code functionality is concerned, we didn't do anything. We just +added an abstract of what the function does. + +Now try this in the ipython interpreter. +:: + + avg? + +It displays the docstring as we gave it. Thus docstring is a good way +of documenting the function we write. + +Try to do this, +:: + + f? + +It doesn't have a docstring associated with it. Also we cannot infer +anything from the function name, and thus we are forced to read the +code to understand anything about the function. + +{{{ switch to next slide, exercise 3 }}} + +%% 3 %% Add docstring to the function f. + +Pause here and try to do it yourself. + +{{{ switch to next slide, solution }}} + +We need to define the function again to add docstring to the function +``f`` and we do it as, +:: + + def f(x): + """Accepts a number x as argument and, + returns the square of the number x.""" + return x*x + +{{{ switch to next slide, exercise 4 }}} + +%% 4 %% Write a python function named ``circle`` which returns the + area and perimeter of a circle given radius ``r``. + +Pause here and try to solve the problem yourself. + +{{{ switch to next slide, solution 4 }}} + +The problem requires us to return two values instead of one which we +were doing till now. We can solve the problem as, +:: + + def circle(r): + """returns area and perimeter of a circle given radius r""" + pi = 3.14 + area = pi * r * r + perimeter = 2 * pi * r + return area, perimeter + +A python function can return any number of values. There is no +restriction for it. + +Let us call the function ``circle`` as, +:: + + a, p = circle(6) + print a + print p + +Now we have done enough coding, let us do some code reading exercise, + +{{{ switch to next slide, what }}} + +What does the function ``what`` do? + +.. def what( n ): +.. if n < 0: n = -n +.. while n > 0: +.. if n % 2 == 1: +.. return False +.. n /= 10 +.. return True + +Pause here and try to figure out what the function ``what`` does. + +{{{ switch to next slide, even_digits }}} + +.. def even_digits( n ): +.. """returns True if all the digits of number n is even +.. returns False if all the digits of number n is not even""" +.. if n < 0: n = -n +.. while n > 0: +.. if n % 2 == 1: +.. return False +.. n /= 10 +.. return True + +The function returns ``True`` if all the digits of the number ``n`` +are even, otherwise it returns ``False``. + +Now one more code reading exercise, + +{{{ switch to next slide, what }}} + +What does the function ``what`` do? + +.. def what( n ): +.. i = 1 +.. while i * i < n: +.. i += 1 +.. return i * i == n, i + +Pause here and try to figure out what the function ``what`` does. + +{{{ switch to next slide, is_perfect_square }}} + +.. def is_perfect_square( n ): +.. """returns True and square root of n, if n is a perfect square, +.. otherwise returns False and the square root of the +.. next perfect square""" +.. i = 1 +.. while i * i < n: +.. i += 1 +.. return i * i == n, i + + +The function returns ``True`` and the square root of ``n`` if n is a +perfect square, otherwise it returns ``False`` and the square root of +the next perfect square. + +This brings us to the end of this tutorial, in this tutorial we covered + +{{{ switch to next slide, summary }}} + +- Functions in Python +- Passing parameters to a function +- Returning values from a function + +We also did few code reading exercises. + +{{{ switch to next slide, Thank you }}} + +Thank you! -- cgit From 669e5ebcb3de2c21b16e0811fdb9f9a8aa564a83 Mon Sep 17 00:00:00 2001 From: Anoop Jacob Thomas Date: Wed, 10 Nov 2010 18:58:11 +0530 Subject: added slides for getting started with functions. --- getting-started-with-functions/slides.org | 289 ++++++++++++++++++++++++++ getting-started-with-functions/slides.tex | 323 ++++++++++++++++++++++++++++++ 2 files changed, 612 insertions(+) create mode 100644 getting-started-with-functions/slides.org create mode 100644 getting-started-with-functions/slides.tex (limited to 'getting-started-with-functions') diff --git a/getting-started-with-functions/slides.org b/getting-started-with-functions/slides.org new file mode 100644 index 0000000..21ca06a --- /dev/null +++ b/getting-started-with-functions/slides.org @@ -0,0 +1,289 @@ +#+LaTeX_CLASS: beamer +#+LaTeX_CLASS_OPTIONS: [presentation] +#+BEAMER_FRAME_LEVEL: 1 + +#+BEAMER_HEADER_EXTRA: \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent} +#+COLUMNS: %45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra) +#+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 + +#+LaTeX_CLASS: beamer +#+LaTeX_CLASS_OPTIONS: [presentation] + +#+LaTeX_HEADER: \usepackage[english]{babel} \usepackage{ae,aecompl} +#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet} + +#+LaTeX_HEADER: \usepackage{listings} + +#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries, +#+LaTeX_HEADER: commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen}, +#+LaTeX_HEADER: showstringspaces=false, keywordstyle=\color{blue}\bfseries} + +#+TITLE: Getting started with functions +#+AUTHOR: FOSSEE +#+EMAIL: info@fossee.in +#+DATE: + +#+DESCRIPTION: +#+KEYWORDS: +#+LANGUAGE: en +#+OPTIONS: H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t +#+OPTIONS: TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc + +# * Outline +# - Manipulating one and multi dimensional arrays +# - Access and change individual elements +# - Access and change rows and columns +# - Slicing and striding on arrays to access chunks +# - Read images into arrays and manipulations +# * Sample Arrays +# #+begin_src python +# In []: A = array([12, 23, 34, 45, 56]) + +# In []: C = array([[11, 12, 13, 14, 15], +# [21, 22, 23, 24, 25], +# [31, 32, 33, 34, 35], +# [41, 42, 43, 44, 45], +# [51, 52, 53, 54, 55]]) + +# #+end_src +# * Question 1 +# Change the last column of ~C~ to zeroes. +# * Solution 1 +# #+begin_src python +# In []: C[:, -1] = 0 +# #+end_src +# * Question 2 +# Change ~A~ to ~[11, 12, 13, 14, 15]~. +# * Solution 2 +# #+begin_src python +# In []: A[:] = [11, 12, 13, 14, 15] +# #+end_src +# * squares.png +# #+begin_latex +# \begin{center} +# \includegraphics[scale=0.6]{squares} +# \end{center} +# #+end_latex +# * Question 3 +# - obtain ~[22, 23]~ from ~C~. +# - obtain ~[11, 21, 31, 41]~ from ~C~. +# - obtain ~[21, 31, 41, 0]~. +# * Solution 3 +# #+begin_src python +# In []: C[1, 1:3] +# In []: C[0:4, 0] +# In []: C[1:5, 0] +# #+end_src +# * Question 4 +# Obtain ~[[23, 24], [33, -34]]~ from ~C~ +# * Solution 4 +# #+begin_src python +# In []: C[1:3, 2:4] +# #+end_src +# * Question 5 +# Obtain the square in the center of the image +# * Solution 5 +# #+begin_src python +# In []: imshow(I[75:225, 75:225]) +# #+end_src +# * Question 6 +# Obtain the following +# #+begin_src python +# [[12, 0], [42, 0]] +# [[12, 13, 14], [0, 0, 0]] +# #+end_src + +# * Solution 6 +# #+begin_src python +# In []: C[::3, 1::3] +# In []: C[::4, 1:4] +# #+end_src +# * Summary +# You should now be able to -- +# - Manipulate 1D \& Multi dimensional arrays +# - Access and change individual elements +# - Access and change rows and columns +# - Slice and stride on arrays +# - Read images into arrays and manipulate them. + + +* Outline + - Define functions + - Pass arguments to functions + - Learn about docstrings + - Return values from functions + +* Function + - Eliminate code redundancy + - Help in code reuse + - Subroutine + - relatively independent of remaining code + +* ~f(x)~ a mathematical function + + $f(x) = x^{2}$ + + : f(1) -> 1 + : f(2) -> 4 + +* Define ~f(x)~ in Python + #+begin_src python + def f(x): + return x*x + #+end_src + + - ~def~ - keyword + - ~f~ - function name + - ~x~ - parameter / argument to function ~f~ + +* Exercise 1 + + Write a python function named ~cube~ which computes the cube of a given + number ~n~. + + - Pause here and try to solve the problem yourself. + +* Solution + #+begin_src python + def cube(n): + return n**3 + #+end_src + +* ~greet~ function + + Function ~greet~ which will print ~Hello World!~. + #+begin_src python + def greet(): + print "Hello World!" + #+end_src + - Call the function ~greet~ + : In []: greet() + : Hello World! + +* Exercise 2 + + Write a python function named ~avg~ which computes the average of + ~a~ and ~b~. + + - Pause here and try to solve the problem yourself. + +* Solution 2 + #+begin_src python + def avg(a,b): + return (a + b)/2 + #+end_src + + - ~a~ and ~b~ are parameters + - ~def f(p1, p2, p3, ... , pn)~ + +* Docstring + + - Documenting/commenting code is a good practice + #+begin_src python + def avg(a,b): + """ avg takes two numbers as input + (a & b), and returns the average + of a and b""" + return (a+b)/2 + #+end_src + - Docstring + - written in the line after the ~def~ line. + - Inside triple quote. + - Documentation + : avg? +* Exercise 3 + Add docstring to the function f. + +* Solution 3 + +#+begin_src python + def f(x): + """Accepts a number x as argument and, + returns the square of the number x.""" + return x*x +#+end_src + +* Exercise 4 + Write a python function named ~circle~ which returns the area and + perimeter of a circle given radius ~r~. + +* Solution 4 +#+begin_src python + def circle(r): + """returns area and perimeter of a circle given + radius r""" + pi = 3.14 + area = pi * r * r + perimeter = 2 * pi * r + return area, perimeter +#+end_src + +* ~what~ +#+begin_src python + + def what( n ): + if n < 0: n = -n + while n > 0: + if n % 2 == 1: + return False + n /= 10 + return True +#+end_src + +* ~even_digits~ +#+begin_src python + def even_digits( n ): + """returns True if all the digits of number + n is even returns False if all the digits + of number n is not even""" + if n < 0: n = -n + while n > 0: + if n % 2 == 1: + return False + n /= 10 + return True +#+end_src + +* ~what~ +#+begin_src python + def what( n ): + i = 1 + while i * i < n: + i += 1 + return i * i == n, i +#+end_src + +* ~is_perfect_square~ +#+begin_src python + def is_perfect_square( n ): + """returns True and square root of n, + if n is a perfect square, otherwise + returns False and the square root + of the next perfect square""" + i = 1 + while i * i < n: + i += 1 + return i * i == n, i +#+end_src + +* Summary + - Functions in Python + - Passing parameters to a function + - Returning values from a function + + - We also did few code reading exercises. + +* Thank you! +#+begin_latex + \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_latex diff --git a/getting-started-with-functions/slides.tex b/getting-started-with-functions/slides.tex new file mode 100644 index 0000000..cab0c4b --- /dev/null +++ b/getting-started-with-functions/slides.tex @@ -0,0 +1,323 @@ +% Created 2010-11-10 Wed 18:55 +\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} +\usepackage{latexsym} +\usepackage{amssymb} +\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 functions} +\author{FOSSEE} +\date{} + +\usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent} +\begin{document} + +\maketitle + + + + + + + + + + + + + + +\begin{frame} +\frametitle{Outline} +\label{sec-1} + +\begin{itemize} +\item Define functions +\item Pass arguments to functions +\item Learn about docstrings +\item Return values from functions +\end{itemize} +\end{frame} +\begin{frame} +\frametitle{Function} +\label{sec-2} + +\begin{itemize} +\item Eliminate code redundancy +\item Help in code reuse +\item Subroutine + +\begin{itemize} +\item relatively independent of remaining code +\end{itemize} + +\end{itemize} +\end{frame} +\begin{frame}[fragile] +\frametitle{\texttt{f(x)} a mathematical function} +\label{sec-3} + + + $f(x) = x^{2}$ + +\begin{verbatim} + f(1) -> 1 + f(2) -> 4 +\end{verbatim} +\end{frame} +\begin{frame}[fragile] +\frametitle{Define \texttt{f(x)} in Python} +\label{sec-4} + +\begin{verbatim} +def f(x): + return x*x +\end{verbatim} + +\begin{itemize} +\item \texttt{def} - keyword +\item \texttt{f} - function name +\item \texttt{x} - parameter / argument to function \texttt{f} +\end{itemize} +\end{frame} +\begin{frame} +\frametitle{Exercise 1} +\label{sec-5} + + + Write a python function named \texttt{cube} which computes the cube of a given + number \texttt{n}. + +\begin{itemize} +\item Pause here and try to solve the problem yourself. +\end{itemize} +\end{frame} +\begin{frame}[fragile] +\frametitle{Solution} +\label{sec-6} + +\begin{verbatim} +def cube(n): + return n**3 +\end{verbatim} +\end{frame} +\begin{frame}[fragile] +\frametitle{\texttt{greet} function} +\label{sec-7} + + + Function \texttt{greet} which will print \texttt{Hello World!}. +\begin{verbatim} +def greet(): + print "Hello World!" +\end{verbatim} +\begin{itemize} +\item Call the function \texttt{greet} +\begin{verbatim} + In []: greet() + Hello World! +\end{verbatim} + +\end{itemize} +\end{frame} +\begin{frame} +\frametitle{Exercise 2} +\label{sec-8} + + + Write a python function named \texttt{avg} which computes the average of + \texttt{a} and \texttt{b}. + +\begin{itemize} +\item Pause here and try to solve the problem yourself. +\end{itemize} +\end{frame} +\begin{frame}[fragile] +\frametitle{Solution 2} +\label{sec-9} + +\begin{verbatim} +def avg(a,b): + return (a + b)/2 +\end{verbatim} + +\begin{itemize} +\item \texttt{a} and \texttt{b} are parameters +\item \texttt{def f(p1, p2, p3, ... , pn)} +\end{itemize} +\end{frame} +\begin{frame}[fragile] +\frametitle{Docstring} +\label{sec-10} + + +\begin{itemize} +\item Documenting/commenting code is a good practice +\begin{verbatim} +def avg(a,b): + """ avg takes two numbers as input + (a & b), and returns the average + of a and b""" + return (a+b)/2 +\end{verbatim} +\item Docstring + +\begin{itemize} +\item written in the line after the \texttt{def} line. +\item Inside triple quote. +\end{itemize} + +\item Documentation +\begin{verbatim} + avg? +\end{verbatim} + +\end{itemize} +\end{frame} +\begin{frame} +\frametitle{Exercise 3} +\label{sec-11} + + Add docstring to the function f. +\end{frame} +\begin{frame}[fragile] +\frametitle{Solution 3} +\label{sec-12} + + +\begin{verbatim} +def f(x): + """Accepts a number x as argument and, + returns the square of the number x.""" + return x*x +\end{verbatim} +\end{frame} +\begin{frame} +\frametitle{Exercise 4} +\label{sec-13} + + Write a python function named \texttt{circle} which returns the area and + perimeter of a circle given radius \texttt{r}. +\end{frame} +\begin{frame}[fragile] +\frametitle{Solution 4} +\label{sec-14} + +\begin{verbatim} +def circle(r): + """returns area and perimeter of a circle given + radius r""" + pi = 3.14 + area = pi * r * r + perimeter = 2 * pi * r + return area, perimeter +\end{verbatim} +\end{frame} +\begin{frame}[fragile] +\frametitle{\texttt{what}} +\label{sec-15} + +\begin{verbatim} + +def what( n ): + if n < 0: n = -n + while n > 0: + if n % 2 == 1: + return False + n /= 10 + return True +\end{verbatim} +\end{frame} +\begin{frame}[fragile] +\frametitle{\texttt{even\_digits}} +\label{sec-16} + +\begin{verbatim} +def even_digits( n ): + """returns True if all the digits of number + n is even returns False if all the digits + of number n is not even""" + if n < 0: n = -n + while n > 0: + if n % 2 == 1: + return False + n /= 10 + return True +\end{verbatim} +\end{frame} +\begin{frame}[fragile] +\frametitle{\texttt{what}} +\label{sec-17} + +\begin{verbatim} +def what( n ): + i = 1 + while i * i < n: + i += 1 + return i * i == n, i +\end{verbatim} +\end{frame} +\begin{frame}[fragile] +\frametitle{\texttt{is\_perfect\_square}} +\label{sec-18} + +\begin{verbatim} +def is_perfect_square( n ): + """returns True and square root of n, + if n is a perfect square, otherwise + returns False and the square root + of the next perfect square""" + i = 1 + while i * i < n: + i += 1 + return i * i == n, i +\end{verbatim} +\end{frame} +\begin{frame} +\frametitle{Summary} +\label{sec-19} + +\begin{itemize} +\item Functions in Python +\item Passing parameters to a function +\item Returning values from a function +\item We also did few code reading exercises. +\end{itemize} +\end{frame} +\begin{frame} +\frametitle{Thank you!} +\label{sec-20} + + \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} -- cgit From f3472c6f870498dadafa68013455c7f2105ffe34 Mon Sep 17 00:00:00 2001 From: Anoop Jacob Thomas Date: Wed, 10 Nov 2010 19:00:23 +0530 Subject: removed unwanted data from slides.org file for getting started with functions. --- getting-started-with-functions/slides.org | 78 ------------------------------- getting-started-with-functions/slides.tex | 7 +-- 2 files changed, 1 insertion(+), 84 deletions(-) (limited to 'getting-started-with-functions') diff --git a/getting-started-with-functions/slides.org b/getting-started-with-functions/slides.org index 21ca06a..8e45b59 100644 --- a/getting-started-with-functions/slides.org +++ b/getting-started-with-functions/slides.org @@ -29,84 +29,6 @@ #+OPTIONS: H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t #+OPTIONS: TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc -# * Outline -# - Manipulating one and multi dimensional arrays -# - Access and change individual elements -# - Access and change rows and columns -# - Slicing and striding on arrays to access chunks -# - Read images into arrays and manipulations -# * Sample Arrays -# #+begin_src python -# In []: A = array([12, 23, 34, 45, 56]) - -# In []: C = array([[11, 12, 13, 14, 15], -# [21, 22, 23, 24, 25], -# [31, 32, 33, 34, 35], -# [41, 42, 43, 44, 45], -# [51, 52, 53, 54, 55]]) - -# #+end_src -# * Question 1 -# Change the last column of ~C~ to zeroes. -# * Solution 1 -# #+begin_src python -# In []: C[:, -1] = 0 -# #+end_src -# * Question 2 -# Change ~A~ to ~[11, 12, 13, 14, 15]~. -# * Solution 2 -# #+begin_src python -# In []: A[:] = [11, 12, 13, 14, 15] -# #+end_src -# * squares.png -# #+begin_latex -# \begin{center} -# \includegraphics[scale=0.6]{squares} -# \end{center} -# #+end_latex -# * Question 3 -# - obtain ~[22, 23]~ from ~C~. -# - obtain ~[11, 21, 31, 41]~ from ~C~. -# - obtain ~[21, 31, 41, 0]~. -# * Solution 3 -# #+begin_src python -# In []: C[1, 1:3] -# In []: C[0:4, 0] -# In []: C[1:5, 0] -# #+end_src -# * Question 4 -# Obtain ~[[23, 24], [33, -34]]~ from ~C~ -# * Solution 4 -# #+begin_src python -# In []: C[1:3, 2:4] -# #+end_src -# * Question 5 -# Obtain the square in the center of the image -# * Solution 5 -# #+begin_src python -# In []: imshow(I[75:225, 75:225]) -# #+end_src -# * Question 6 -# Obtain the following -# #+begin_src python -# [[12, 0], [42, 0]] -# [[12, 13, 14], [0, 0, 0]] -# #+end_src - -# * Solution 6 -# #+begin_src python -# In []: C[::3, 1::3] -# In []: C[::4, 1:4] -# #+end_src -# * Summary -# You should now be able to -- -# - Manipulate 1D \& Multi dimensional arrays -# - Access and change individual elements -# - Access and change rows and columns -# - Slice and stride on arrays -# - Read images into arrays and manipulate them. - - * Outline - Define functions - Pass arguments to functions diff --git a/getting-started-with-functions/slides.tex b/getting-started-with-functions/slides.tex index cab0c4b..e9eaa81 100644 --- a/getting-started-with-functions/slides.tex +++ b/getting-started-with-functions/slides.tex @@ -1,4 +1,4 @@ -% Created 2010-11-10 Wed 18:55 +% Created 2010-11-10 Wed 18:59 \documentclass[presentation]{beamer} \usepackage[latin1]{inputenc} \usepackage[T1]{fontenc} @@ -41,11 +41,6 @@ showstringspaces=false, keywordstyle=\color{blue}\bfseries} - - - - - \begin{frame} \frametitle{Outline} \label{sec-1} -- cgit From 0444c8f74ed5aa5afc8aa6d8d91ad10302cbbb98 Mon Sep 17 00:00:00 2001 From: Anoop Jacob Thomas Date: Wed, 10 Nov 2010 21:17:33 +0530 Subject: Added quickref to getting started with functions. --- getting-started-with-functions/quickref.tex | 4 ++++ 1 file changed, 4 insertions(+) create mode 100644 getting-started-with-functions/quickref.tex (limited to 'getting-started-with-functions') diff --git a/getting-started-with-functions/quickref.tex b/getting-started-with-functions/quickref.tex new file mode 100644 index 0000000..a4f5a33 --- /dev/null +++ b/getting-started-with-functions/quickref.tex @@ -0,0 +1,4 @@ +Defining a function:\\ +{\ex \lstinline| def name([arguments]):|} +{\ex \lstinline| code|} +{\ex \lstinline| [return values]|} -- cgit