diff -r 00c1ba1cb9ef -r 501383b753c1 using-plot-interactively/script.rst --- a/using-plot-interactively/script.rst Thu Nov 11 12:19:32 2010 +0530 +++ b/using-plot-interactively/script.rst Thu Nov 11 13:21:10 2010 +0530 @@ -21,11 +21,10 @@ 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. -{{{ Show the Title Slide }}} I hope you have IPython running on your computer. @@ -52,13 +51,11 @@ {{{ Slide with Error written on it }}} - - Then you have to install matplotlib and run this command again. Now type in your ipython shell :: - In[]: linpace? + linpace? @@ -66,20 +63,20 @@ calculated over the interval start and stop. To illustrate this, lets do it form 1 to 100 and try 100 points. :: - In[]: linspace(1,100,100) + 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 :: - In[]: linspace(0,1,200) + 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 :: - In[]: p = linspace(-pi,pi,100) + p = linspace(-pi,pi,100) 'pi' here is constant defined by pylab. Save this to the variable, p @@ -87,17 +84,17 @@ If you now :: - In[]: len(p) + 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 :: +points. Simply type:: + plot(p,cos(points)) - In[]: plot(p,cos(points)) Here cos(points) gets the cosine value at every corresponding point to p. @@ -106,15 +103,15 @@ We can also save cos(points) to variable cosine and plot it using plot.:: - In[]: cosine=cos(points) + cosine=cos(points) - In[]: plot(p,cosine) + plot(p,cosine) Now do :: - In[]: clf() + clf() this will clear the plot. @@ -124,7 +121,7 @@ plot. :: - In []: plot(p,sin(p)) + plot(p,sin(p)) @@ -144,37 +141,57 @@ -{{{ Action corelating with the words }}} +{{{ 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. +Formats like png ,eps ,pdf, ps are available. -Left to the save button is the slider button to specify the margins. +Left to the save button is the slider button to specify the margins. -{{{ Action corelating with the words }}} +{{{ 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. -{{{ Action corelating with the words }}} +{{{ 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. -{{{ Action corelating with the words }}} +{{{ Press home button }}} The last one is 'home' referring to the initial plot. -{{{ Action corelating with the words}}} + + + +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 @@ -190,10 +207,7 @@ 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 }}} + {{{ Show the "sponsored by FOSSEE" slide }}}