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−\documentclass[12pt]{article}
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−
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−
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−\title{Plotting Points}
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−\author{FOSSEE}
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−\usepackage{listings}
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−\lstset{language=Python,
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−    basicstyle=\ttfamily,
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−  commentstyle=\itshape\bfseries,
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−  showstringspaces=false,
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−}
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−\newcommand{\typ}[1]{\lstinline{#1}}
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−\usepackage[english]{babel}
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−\usepackage[latin1]{inputenc}
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−\usepackage{times}
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−\usepackage[T1]{fontenc}
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−\usepackage{ae,aecompl}
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−\usepackage{mathpazo,courier,euler}
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−\usepackage[scaled=.95]{helvet}
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−
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−\begin{document}
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−\date{}
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−\vspace{-1in}
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−\begin{center}
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−\LARGE{Plotting Points}\\
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−\large{FOSSEE}
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−\end{center}
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−
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−\section{Plotting Points with Lists}
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−
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−\begin{lstlisting}
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−In []: x = [0, 1, 2, 3] # Creating a list
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−In []: y = [7, 11, 15, 19]
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−In []: plot(x, y)
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−In []: clf()
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−In []: plot(x, y, 'o')  # Plotting Circles
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−\end{lstlisting}
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−
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−\subsection{Line style/marker}
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−\begin{lstlisting}
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−The following format string characters are accepted 
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−to control the line style or marker:
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−    
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−    ================    ===============================
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−    character           description
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−    ================    ===============================
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−    '-'                 solid line style
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−    '--'                dashed line style
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−    '-.'                dash-dot line style
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−    ':'                 dotted line style
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−    '.'                 point marker
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−    ','                 pixel marker
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−    'o'                 circle marker
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−    'v'                 triangle_down marker
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−    '^'                 triangle_up marker
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−    '<'                 triangle_left marker
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−    '>'                 triangle_right marker
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−    '1'                 tri_down marker
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−    '2'                 tri_up marker
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−    '3'                 tri_left marker
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−    '4'                 tri_right marker
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−    's'                 square marker
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−    'p'                 pentagon marker
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−    '*'                 star marker
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−    'h'                 hexagon1 marker
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−    'H'                 hexagon2 marker
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−    '+'                 plus marker
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−    'x'                 x marker
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−    'D'                 diamond marker
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−    'd'                 thin_diamond marker
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−    '|'                 vline marker
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−    '_'                 hline marker
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−    ================    ===============================
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−
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−\end{lstlisting}
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−
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−\subsection{Marker combinations}
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−\typ{In []: plot(x, y, 'ro')} \\
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−This plots figure with red colored filled circles.\\
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−Similarly other combination of colors and marker can be used.
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−\section{Lists}
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−
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−Initializing
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−  \begin{lstlisting}
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−In []: mtlist = []      # Empty List
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−In []: lst = [ 1, 2, 3, 4, 5] 
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−  \end{lstlisting}
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−Slicing
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−\begin{lstlisting}
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−In []: lst[1:3]         # A slice.
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−Out[]: [2, 3]
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−
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−In []: lst[1:-1]
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−Out[]: [2, 3, 4]
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−\end{lstlisting}
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−\subsection{Appending to lists}
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−\begin{lstlisting}
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−In []: a = [ 6, 7, 8, 9]
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−In []: b = lst + a
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−In []: b
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−Out[]: [1, 2, 3, 4, 5, 6, 7, 8, 9]
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−
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−In []: lst.append(6)
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−In []: lst
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−Out[]: [ 1, 2, 3, 4, 5, 6]
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−\end{lstlisting}
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−\subsection{Iterating over a List}
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−\begin{lstlisting}
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−In []: for element in b:  # Iterating over the list, element-wise
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− ....:     print element       # Print each element
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− ....:
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−\end{lstlisting}
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−
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−\section{Strings}
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−\subsection{Splitting Strings}
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−\begin{lstlisting}
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−In []: greet = ``hello world''
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−In []: print greet.split()
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−Out[]: ['hello', 'world']
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−In []: greet = ``hello, world''
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−In []: print greet.split(',')
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−Out[]: ['hello', ' world'] # Note the white space before 'world'
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−\end{lstlisting}
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−A string can be split based on the delimiter specified within quotes. A combination of more than one delimiter can also be used.\\
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−\typ{In []: greet.split(', ')}\\
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−\typ{Out[]: ['hello', 'world']}\\Note the white space is not there anymore.
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−\newpage
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−\section{Plotting from Files}
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−\subsection{Opening files}
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−
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−\typ{In []: f = open('datafile.txt')}\\By default opens in read mode. \\If file does not exist then it throws an exception\\
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−\typ{In []: f = open('datafile.txt','r')}\\Specifying the read mode\\
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−\typ{In []: f = open('datafile.txt', 'w')}\\Opens the file in write mode. \\If the file already exists, then it deletes all the previous content and opens.
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−
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−\subsection{Reading from files}
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−Just like lists files are iterable as well.
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−
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−\begin{lstlisting}
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−  In []: for line in f:
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−    ...:     print line
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−    ...: 
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−    ...:
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−\end{lstlisting}
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−
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−\subsection{Plotting}
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−\begin{lstlisting}
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−l = []
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−t = []
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−for line in open('pendulum.txt'):
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−    point = line.split()
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−    l.append(float(point[0]))
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−    t.append(float(point[1]))
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−tsq = []
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−for time in t:
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−    tsq.append(time*time)
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−plot(l, tsq, '.')
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−\end{lstlisting}
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−
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−\end{document}
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−