savefig/script.rst
author anand
Mon, 08 Nov 2010 01:36:47 +0530
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.. Objectives
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.. ----------
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.. At the end of this tutorial, you will be able to 
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.. 1. Save plots using ``savefig()`` function.
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.. #. Save plots in different formats.
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.. Prerequisites
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.. -------------
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..   1. should have ``ipython`` and ``pylab`` installed. 
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..   #. getting started with ``ipython``.
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..   #. using plot command interactively.
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.. Author              : Anoop Jacob Thomas <anoop@fossee.in>
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   Internal Reviewer   : Puneeth
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   External Reviewer   :
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   Checklist OK?       : <put date stamp here, if OK> [2010-10-05]
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.. #[Puneeth: Quickref missing.]
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=======
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Savefig
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=======
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{{{ Show the first slide }}}
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Hello and welcome to the tutorial saving plots.
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{{{ switch to next slide, outline slide }}}
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In this tutorial you will learn how to save plots using Python, saving
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in different formats, and locating the file in the file system.
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.. #[Puneeth: file-system is too technical.]
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{{{ switch to next slide, a sine wave}}}
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Start your IPython interpreter with the command ::
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  ipython -pylab
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As you know, it will start your IPython interpreter with the required
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python modules for plotting and saving your plots.
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{{{ Open ipython }}}
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Now let us plot something, let us plot a sine wave from minus 3 pi to
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3 pi. Let us start by calculating the required points for the plot. It
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can be done using linspace as, ::
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  x = linspace(-3*pi,3*pi,100)
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We have stored required points in x. Now let us plot the points using
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the statement ::
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  plot(x,sin(x))
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{{{ Keep the plot open }}}
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Done! we have made a very basic sine plot, now let us see how to save
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the plot for future use so that you can embed the plot in your
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reports.
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.. #[Puneeth: All this is known stuff. You don't have to elaborate so
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.. much on it. Just say, let us plot sin function from -3 pi to 3
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.. pi. Show the commands, and be done with it. ]
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{{{ switch to next slide, savefig() }}}
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{{{ Switch the focus to IPython interpreter window }}}
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For saving the plot, we will use ``savefig()`` function, and it has to be
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done with the plot window open. The statement is, ::
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  savefig('/home/fossee/sine.png')
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Notice that ``savefig`` function takes one argument which is the
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filename. The last 3 characters after the ``.`` in the filename is the
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extension or type of the file which determines the format in which you
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want to save.
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.. #[Puneeth: removed mention of string]
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.. #[[Anoop: I think this treatment is better :) ]]
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{{{ Highlight the /home/fossee part using mouse movements }}}
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Also, note that we gave the full path or the absolute path to which we
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want to save the file.
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{{{ Highlight the .png part using mouse movements }}}
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Here I have used an extension ``.png`` which means i want to save the
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image as a PNG file.
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Now let us locate ``sine.png`` file saved. We saved the file to
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``/home/fossee`` so let us navigate to ``/home/fossee`` using the
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file browser.
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{{{ Open the browser, navigate to /home/fossee and highlight the file
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sine.png }}}
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Yes, the file ``sine.png`` is here and let us check it.
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{{{ Open the file sine.png and show it for two-three seconds and then
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close it and return to IPython interpreter, make sure the plot window
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is still open, also don't close the file browser window }}}
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{{{ switch to next slide, More on savefig() }}}
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So in-order to save a plot, we use ``savefig`` function. ``savefig``
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can save the plot in many formats, such as pdf - portable document
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format, ps - post script, eps - encapsulated post script, svg -
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scalable vector graphics, png - portable network graphics which
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support transparency etc.
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.. #[[slide must give the extensions for the files - Anoop]]
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{{{ switch to next slide, exercise 1 }}}
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Let us now try to save the plot in eps format. ``eps`` stands for
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encapsulated post script, and it can be embedded in your latex
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documents. Pause here and try to figure it out yourself.
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{{{ Switch focus to the already open plot window }}}
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We still have the sine plot with us, and now let us save the plot as
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``sine.eps``.
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{{{ switch to next slide, solution 1 }}}
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{{{ Switch focus to IPython interpreter }}}
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Now, We will save the plot using the function ``savefig`` ::
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  savefig('/home/fossee/sine.eps')
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{{{ Switch focus to file browser window }}}
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Now let us go to ``/home/fossee`` and see the new file created.
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{{{ Highlight the file sine.eps with a single mouse click for 2
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seconds and then double click and open the file }}}
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Yes! the new file ``sine.eps`` is here.
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{{{ switch to next slide, exercise 2 }}}
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Now you may try saving the same in pdf, ps, svg formats.
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{{{ Switch to summary slide }}}
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This brings us to the end of this tutorial, in this tutorial we
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learned to save plots using the function ``savefig()``. Saving the
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plots in different formats and locating the files in the file system.
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{{{ switch to Thank you slide }}}
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Thank you!