author | Anoop Jacob Thomas<anoop@fossee.in> |
Sat, 18 Dec 2010 12:54:49 +0530 | |
changeset 524 | b602b4dcc87d |
parent 522 | d33698326409 |
permissions | -rw-r--r-- |
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.. Objectives |
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.. ---------- |
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.. By the end of this tutorial you will -- |
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.. 1. Create simple plots of mathematical functions |
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.. #. Use the Figure window to study plots better |
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.. Prerequisites |
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.. ------------- |
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.. Installation of required tools |
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.. Ipython |
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.. Author : Amit Sethi |
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Internal Reviewer : |
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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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Script |
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------- |
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{{{ Show the Title Slide }}} |
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Hello and welcome to the tutorial on creating simple plots using |
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Python.This tutorial is presented by the Fossee group. |
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|
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I hope you have IPython running on your computer. |
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In this tutorial we will look at plot command and also how to study |
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the plot using the UI. |
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{{{ Show Outline Slide }}} |
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Lets start ipython on your shell, type :: |
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$ipython -pylab |
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Pylab is a python library which provides plotting functionality.It |
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also provides many other important mathematical and scientific |
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functions. After running IPython -pylab in your shell if at the top of |
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the result of this command, you see something like :: |
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`ERROR: matplotlib could NOT be imported! Starting normal |
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IPython.` |
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{{{ Slide with Error written on it }}} |
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Then you have to install matplotlib and run this command again. |
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Now type in your ipython shell :: |
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linpace? |
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as the documentation says, it returns `num` evenly spaced samples, |
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calculated over the interval start and stop. To illustrate this, lets |
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do it form 1 to 100 and try 100 points. :: |
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linspace(1,100,100) |
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As you can see a sequence of numbers from 1 to 100 appears. |
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Now lets try 200 points between 0 and 1 you do this by typing :: |
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linspace(0,1,200) |
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0 for start , 1 for stop and 200 for no of points. In linspace |
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the start and stop points can be integers, decimals , or |
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constants. Let's try and get 100 points between -pi to pi. Type :: |
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p = linspace(-pi,pi,100) |
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'pi' here is constant defined by pylab. Save this to the variable, p |
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. |
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If you now :: |
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len(p) |
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You will get the no. of points. len function gives the no of elements |
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of a sequence. |
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Let's try and plot a cosine curve between -pi and pi using these |
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points. Simply type:: |
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plot(p,cos(points)) |
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Here cos(points) gets the cosine value at every corresponding point to |
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p. |
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We can also save cos(points) to variable cosine and plot it using |
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plot.:: |
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cosine=cos(points) |
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plot(p,cosine) |
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Now do :: |
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clf() |
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this will clear the plot. |
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This is done because any other plot we try to make shall come on the |
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same drawing area. As we do not wish to clutter the area with |
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overlaid plots , we just clear it with clf(). Now lets try a sine |
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plot. :: |
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plot(p,sin(p)) |
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The Window on which the plot appears can be used to study it better. |
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{{{ Show the slide with all the buttons on it }}} |
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First of all moving the mouse around gives us the point where mouse |
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points at. |
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Also we have some buttons the right most among them is |
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for saving the file. |
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Just click on it specifying the name of the file. We will save the plot |
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by the name sin_curve in pdf format. |
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{{{ Show how to save the file }}} |
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As you can see I can specify format of file from the dropdown. |
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Formats like png ,eps ,pdf, ps are available. |
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Left to the save button is the slider button to specify the margins. |
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{{{ Show how to zoom. Press zoom button and specify region to zoom }}} |
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Left to this is zoom button to zoom into the plot. Just specify the |
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region to zoom into. |
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{{{ Press Move button and move the axes. }}} |
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The button left to it can be used to move the axes of the plot. |
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{{{ Press Back and Forward Button }}} |
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The next two buttons with a left and right arrow icons change the state of the |
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plot and take it to the previous state it was in. It more or less acts like a |
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back and forward button in the browser. |
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{{{ Press home button }}} |
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The last one is 'home' referring to the initial plot. |
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Following is an exercise that you must do. |
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%% %% Plot (sin(x)*sin(x))/x . |
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1. Save the plot by the sinsquarebyx.pdf in pdf format. |
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2. Zoom and find the maxima. |
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3. Bring it back to initial position. |
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Please, pause the video here. Do the exercise and then continue. |
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{{{ Summary Slide }}} |
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In this tutorial we have looked at |
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1. Starting Ipython with pylab |
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2. Using linspace function to create `num` equaly spaced points in a region. |
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3. Finding length of sequnces using len. |
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4. Plotting mathematical functions using plot. |
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4. Clearing drawing area using clf |
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5. Using the UI of plot for studying it better . Using functionalities like save , zoom and moving the plots on x and y axis |
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{{{ Show the "sponsored by FOSSEE" slide }}} |
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This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India |
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Hope you have enjoyed and found it useful. |
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Thankyou |
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Author : Amit Sethi |
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Internal Reviewer : |
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Internal Reviewer 2 : |