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+.. Objectives
+.. ----------
+
+.. By the end of this tutorial you will --
+
+.. 1. Create simple plots of mathematical functions
+.. #. Use the Figure window to study plots better
+
+
+
+.. Prerequisites
+.. -------------
+
+.. Installation of required tools
+.. Ipython
+
+.. Author : Amit Sethi
+ Internal Reviewer :
+ External Reviewer :
+ Checklist OK? : <put date stamp here, if OK> [2010-10-05]
+
+Script
+-------
+{{{ Show the Title Slide }}}
+
+Hello and welcome to the tutorial on creating simple plots using
+Python.This tutorial is presented by the Fossee group.
+
+I hope you have IPython running on your computer.
+
+In this tutorial we will look at plot command and also how to study
+the plot using the UI.
+
+{{{ Show Outline Slide }}}
+
+Lets start ipython on your shell, type ::
+
+ $ipython -pylab
+
+
+Pylab is a python library which provides plotting functionality.It
+also provides many other important mathematical and scientific
+functions. After running IPython -pylab in your shell if at the top of
+the result of this command, you see something like ::
+
+
+ `ERROR: matplotlib could NOT be imported! Starting normal
+ IPython.`
+
+
+{{{ Slide with Error written on it }}}
+
+
+Then you have to install matplotlib and run this command again.
+
+Now type in your ipython shell ::
+
+ linpace?
+
+
+
+as the documentation says, it returns `num` evenly spaced samples,
+calculated over the interval start and stop. To illustrate this, lets
+do it form 1 to 100 and try 100 points. ::
+
+ linspace(1,100,100)
+
+As you can see a sequence of numbers from 1 to 100 appears.
+
+Now lets try 200 points between 0 and 1 you do this by typing ::
+
+
+ linspace(0,1,200)
+
+0 for start , 1 for stop and 200 for no of points. In linspace
+the start and stop points can be integers, decimals , or
+constants. Let's try and get 100 points between -pi to pi. Type ::
+
+ p = linspace(-pi,pi,100)
+
+
+'pi' here is constant defined by pylab. Save this to the variable, p
+.
+
+If you now ::
+
+ len(p)
+
+You will get the no. of points. len function gives the no of elements
+of a sequence.
+
+
+Let's try and plot a cosine curve between -pi and pi using these
+points. Simply type::
+
+ plot(p,cos(points))
+
+
+Here cos(points) gets the cosine value at every corresponding point to
+p.
+
+
+We can also save cos(points) to variable cosine and plot it using
+plot.::
+
+ cosine=cos(points)
+
+ plot(p,cosine)
+
+
+
+Now do ::
+
+ clf()
+
+this will clear the plot.
+
+This is done because any other plot we try to make shall come on the
+same drawing area. As we do not wish to clutter the area with
+overlaid plots , we just clear it with clf(). Now lets try a sine
+plot. ::
+
+
+ plot(p,sin(p))
+
+
+
+
+The Window on which the plot appears can be used to study it better.
+
+{{{ Show the slide with all the buttons on it }}}
+
+First of all moving the mouse around gives us the point where mouse
+points at.
+
+Also we have some buttons the right most among them is
+for saving the file.
+
+Just click on it specifying the name of the file. We will save the plot
+by the name sin_curve in pdf format.
+
+
+
+{{{ Show how to save the file }}}
+
+As you can see I can specify format of file from the dropdown.
+
+Formats like png ,eps ,pdf, ps are available.
+
+Left to the save button is the slider button to specify the margins.
+
+{{{ Show how to zoom. Press zoom button and specify region to zoom }}}
+
+Left to this is zoom button to zoom into the plot. Just specify the
+region to zoom into.
+
+{{{ Press Move button and move the axes. }}}
+
+The button left to it can be used to move the axes of the plot.
+
+{{{ Press Back and Forward Button }}}
+
+The next two buttons with a left and right arrow icons change the state of the
+plot and take it to the previous state it was in. It more or less acts like a
+back and forward button in the browser.
+
+{{{ Press home button }}}
+
+The last one is 'home' referring to the initial plot.
+
+
+
+
+Following is an exercise that you must do.
+
+%% %% Plot (sin(x)*sin(x))/x .
+ 1. Save the plot by the sinsquarebyx.pdf in pdf format.
+ 2. Zoom and find the maxima.
+
+ 3. Bring it back to initial position.
+
+
+Please, pause the video here. Do the exercise and then continue.
+
+
+
+
+
+
+
+
+
+{{{ Summary Slide }}}
+
+In this tutorial we have looked at
+
+1. Starting Ipython with pylab
+
+2. Using linspace function to create `num` equaly spaced points in a region.
+
+3. Finding length of sequnces using len.
+
+4. Plotting mathematical functions using plot.
+
+4. Clearing drawing area using clf
+
+5. Using the UI of plot for studying it better . Using functionalities like save , zoom and moving the plots on x and y axis
+
+
+ {{{ Show the "sponsored by FOSSEE" slide }}}
+
+
+
+This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India
+
+
+
+ Hope you have enjoyed and found it useful.
+
+ Thankyou
+
+
+
+Author : Amit Sethi
+Internal Reviewer :
+Internal Reviewer 2 :