author | Puneeth Chaganti <punchagan@gmail.com> |
Sat, 01 May 2010 16:30:45 +0530 | |
changeset 396 | 502d4d151fa2 |
parent 341 | 7ae88b9da553 |
permissions | -rwxr-xr-x |
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\documentclass[12pt]{article} |
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\title{Interactive Plotting} |
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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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\begin{document} |
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\date{} |
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\vspace{-1in} |
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\begin{center} |
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\LARGE{Interactive Plotting}\\ |
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\large{FOSSEE} |
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\end{center} |
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\section{Starting up...} |
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\begin{lstlisting} |
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$ ipython -pylab |
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\end{lstlisting} |
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Exiting |
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\begin{lstlisting} |
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In [2]: (Ctrl-D)^D |
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Do you really want to exit ([y]/n)? y |
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\end{lstlisting} %$ |
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\section{Plotting} |
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\subsection{linspace} |
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\typ{In []: x = linspace(start, stop, num)}\\ |
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\typ{linspace} returns array of length \typ{num}, for which \typ{x[0] = start} and \typ{x[num-1] = stop} \\ |
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\emph{Please note indices of array starts from zero(0)} |
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\subsection{plot} |
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\typ{In []: plot(X, Y)}\\ |
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For given arrays of equal length(above case X and Y), \typ{plot} plots the corresponding *x* and *y* pairs taken from X and Y. |
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\subsection{Colors of plots} |
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\typ{In []: plot(y, sin(y), 'g')}\\ |
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Plots graph with green color. Other options available are: |
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\begin{lstlisting} |
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'r' ---> Red |
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'b' ---> Blue |
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'r' ---> Red |
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'c' ---> Cyan |
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'm' ---> Magenta |
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'y' ---> Yellow |
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'k' ---> Black |
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'w' ---> White |
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\end{lstlisting} |
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One can set the width of the plotline using optional argument \typ{linewidth}. For example:\\ |
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\typ{In []: plot(x, cos(x), 'r', linewidth=2)}\\ |
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Plots the line with linewidth = 2 |
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\subsection{label and title} |
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\typ{In []: xlabel('Length') #sets *x* axis label to Length}\\ |
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\typ{In []: ylabel('Time') #sets *y* axis label to Time.}\\ |
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\typ{In []: title('Sinusoids') #sets title of plot}\\ |
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\\ |
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\textbf{Additionally}\\ |
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Pylab accepts TeX equation expressions in any text expression. To get something like:\\ |
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$\sigma_i=15$ \\ |
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on title of figure use: |
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\begin{lstlisting} |
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In []: title('$\sigma_i=15$') |
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\end{lstlisting} |
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Same way one can have TeX expression on xlabel, ylabel etc. |
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|
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\subsection{legends} |
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\typ{In []: legend('sin(x)',loc=center)} \\ |
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Places a legend on the current plot at location *loc*.\\ |
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Apart from \typ{center}, some other \typ{loc} which can be specified are: |
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\begin{lstlisting} |
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'best' |
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'right' |
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'upper right' |
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'upper left' |
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'lower left' |
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'lower right' |
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'center left' |
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'center right' |
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'lower center' |
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'upper center' |
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\end{lstlisting} |
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\newpage |
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One can also mention explicit co-ordinates for placement of legend. |
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\begin{lstlisting} |
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In []: legend(['sin(2y)'], loc=(.8,.1)) |
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\end{lstlisting} |
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\typ{loc = 0, 1} (top left position of graph)\\ |
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\typ{loc = 0.5, 0.5} (center of graph). |
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|
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\subsection{Annotate} |
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\typ{In []: annotate('local max', xy=(1.5, 1))}\\ |
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Annotates current plot with text, 'local max', at position specified to \typ{xy}. |
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|
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\subsection{Saving figures} |
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\typ{In []: savefig('sinusoids.png')}\\ |
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Saves the current figure with file name 'sinusoids.png' in current working directory. One can save figure in any of these formats: png, pdf, ps, eps and svg. |
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|
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\subsection{Miscellaneous} |
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\typ{In []: clf() #Clears the current plot area}\\ |
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\typ{In []: close() #Closes the figure} |
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\section{Saving and running scripts} |
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\begin{itemize} |
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\item \typ{\%hist}\\ |
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It returns the logs of all commands(including mistakes) used in IPython interpreter. |
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\item \typ{\%hist -n}\\ |
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It disables the line number representation of logs. |
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\item \typ{\%save four\_plot.py 16 18-27}\\ |
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For creating a script named four\_plot which includes line 16 and line 18 to 27 of logs. |
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\item \typ{\%run -i four\_plot.py}\\ |
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Running the python script inside IPython interpreter. |
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\end{itemize} |
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|
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\section{Example} |
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\begin{lstlisting} |
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In []: x = linspace(0, 2*pi, 50) |
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In []: plot(x, sin(x), 'g') |
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In []: plot(x, cos(x), 'r', linewidth=2) |
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In []: xlabel('x') |
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In []: title('Sinusoidal Waves') |
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In []: legend(['sin(x)', 'cos(x)']) |
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In []: annotate('origin', xy=(0, 0)) |
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In []: xmin, xman = xlim() # returns current X axis limits. |
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In []: ymin, ymax = ylim() |
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In []: xlim(0, 2 * pi) # sets the X axis limits to passed values |
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In []: ylim(ymin - 0.2, ymax + 0.2) |
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|
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In []: savefig('sin.png') # Save figure |
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In []: close() |
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\end{lstlisting} |
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|
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\section{References} |
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\begin{itemize} |
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\item For documentation on IPython refer: \\ http://ipython.scipy.org/moin/Documentation |
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\item Plotting(matplotlib) related documentation are available at:\\ http://matplotlib.sourceforge.net/contents.html |
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\item Explore examples and plots based on matplotlib at \\ http://matplotlib.sourceforge.net/examples/index.html |
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\end{itemize} |
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\end{document} |
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