Revised entire script of 'Using plot interactively'.

Rephrased few sentences to make them simple and less dramatic. Changed
few minor sequences to maintain the flow of instructions. Some
instructions were found to be incomplete hence tried to complete them.

1 files changed, 42 insertions, 29 deletions

diff --git a/using_plot_interactively/script.rst b/using_plot_interactively/script.rst
index 43393cb..5de2c30 100644
--- a/using_plot_interactively/script.rst
+++ b/using_plot_interactively/script.rst
@@ -4,7 +4,7 @@
 .. By the end of this tutorial you will --
 
 .. 1. Create simple plots of mathematical functions
-.. #. Use the Figure window to study plots better
+.. 2. Use features of graphical window to manipulate plots
 
 
 
@@ -30,7 +30,8 @@ team along with the logo of MHRD }}}
 
 Hello Friends and welcome to the tutorial on creating simple plots using
 iPython.
-I hope you have IPython running on your computer.
+I hope you have IPython installed on your computer if not, then refer to the spoken tutorial 
+on instaling ipython.
 
 .. L2
 
@@ -39,16 +40,16 @@ I hope you have IPython running on your computer.
 At the end of this tutorial, you will be able to, 
 
    1. Create simple plots of mathematical functions.
-   #. Use the Figure window to study plots better.
+   2. Use features of graphical window to manipulate plots
 
 
 .. R2
 
-In this tutorial we will learn how to plot using the plot command and how to use the user interface of plot figure.
+
 
 .. R3 
 
-Lets start ipython.Open the terminal and type  
+To start ipython, Open the terminal and type  
 ipython -pylab and hit enter.
 
 .. L3
@@ -61,21 +62,31 @@ ipython -pylab and hit enter.
 
 Pylab is a python library which provides plotting functionality.It
 provides many other important mathematical and scientific
-functions. After running IPython -pylab in the shell you will see some 
-information about ipython and pylab followed by the In[1] prompt.But if you get an error like ::
+functions.
+After running IPython -pylab in your shell, 
+the screen will look like this.
+
+.. Pause the video for 2 sec then continue. 
+
+But instead if you get the following error like::
+
+- show the error slide
 
    `ERROR: matplotlib could NOT be imported!  Starting normal
       IPython.`
 
 Then you will have to install the matplotlib and run this command again.
 
+.. Add some instruction to help user to install matplotlib.
+
 .. L4
 
 {{{ Slide with Error written on it }}}
 
 .. R5
 
-Now type 'linspace' followed by a '?' mark in your ipython shell 
+To get array of numbers we use linspace command. 
+Type 'linspace' followed by a '?' mark to get detailed documentation/help of it
              
 .. L5
 
@@ -85,10 +96,9 @@ Now type 'linspace' followed by a '?' mark in your ipython shell
 
 .. R6
 
-as the documentation says, it returns `num` evenly spaced samples,
+As the documentation says, it returns `num` evenly spaced samples,
 calculated over the interval start and stop.  To illustrate this, lets
 try to generate 100 points.Type ``linspace(1,100,100)`` and hit enter.
-As you can see a sequence of numbers from 1 to 100 appears.
 
 .. L6
 
@@ -96,9 +106,11 @@ As you can see a sequence of numbers from 1 to 100 appears.
     
     linspace(1,100,100)
 
+As you can see a sequence of numbers from 1 to 100 appears.
+
 .. R7
 
-Now lets try to generate 200 points between 0 and 1,we do that by typing  linspace(0,1,200).
+To generate 200 points between 0 and 1, type linspace(0,1,200).
 
 .. L7
 
@@ -108,10 +120,10 @@ Now lets try to generate 200 points between 0 and 1,we do that by typing  linspa
 
 .. R8
 
-Here,0 is the start , 1 the stop and 200 the number of points.In linspace 
+Here,0 is the start , 1 is the stop and 200 is the number 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.Here 'pi' is a constant 
-defined by pylab. Save this to the variable,say p.
+To get 100 points between -pi to pi where 'pi' is a constant 
+defined by pylab and save the result to the variable,say p. Type p=linspace(-pi,pi,100).
            
 .. L8
 
@@ -121,9 +133,7 @@ defined by pylab. Save this to the variable,say p.
 
 .. R9
 
-If we now type ``len(p)``
-we will get the no. of points. len function gives the no of elements
-of a sequence.
+To get the number of elements or points of a sequence say p type ''len(p)''
 
 .. L9
  
@@ -134,7 +144,7 @@ of a sequence.
 
 .. R10
 
-Let's try and plot a cosine curve between -pi and pi.For this we use the plot command.
+To plot a cosine curve between -pi and pi, we use the plot command.
 Here cos(p) gets the cosine value at every point
 corresponding to point p. 
 
@@ -158,7 +168,7 @@ plot function.
 
 .. R12
 
-Now to clear the plot ,we use the ``clf()`` function 
+To clear the plot, use the ``clf()`` function 
 
 .. L12 
      
@@ -168,8 +178,9 @@ Now to clear the plot ,we use the ``clf()`` function
 
 .. R13
 
-This is done because if we wish to make another plot,it will overlap the previous plot.
-As we do not wish to clutter the area with overlaid plots , we just clear it with clf().  
+If the plot is not cleared, then any new plot will overlap the previous plot. Hence to avoid 
+cluttering the area with overlaid plots use clf() function.
+ 
 Now lets try a sine plot. 
 
 .. L13
@@ -180,7 +191,7 @@ Now lets try a sine plot.
 
 .. R14 
 
-We can study the plot better on the plot window by using the various options available on it.Let us have a look at these options.
+We can manipulate the plot in the graphical window.
 
 .. L14
 
@@ -188,7 +199,8 @@ We can study the plot better on the plot window by using the various options ava
 
 .. R15
 
-As we can observe, moving the mouse pointer along the plot gives us the location of each point on the plot 
+The location of the mouse pointer on the window is displayed in bottom right corner of the window.
+By moving the mouse pointer the location of each point is seen.
 
 .. L15
 
@@ -198,9 +210,9 @@ As we can observe, moving the mouse pointer along the plot gives us the location
 
 To the bottom left of the window,there are a few buttons.The right most among them is
 for saving the file. 
-Just click on it and type the file name. We will save the plot 
+Just click on it and type the file name in the box provided. We will save the plot 
 by the name `sin_curve` in pdf format.As you can see we can specify the format 
-of file from the dropdown.Formats like png ,eps ,pdf, ps are available.
+of file from the dropdown. Formats like png ,eps ,pdf, ps are also available.
 
 .. L16
 
@@ -255,7 +267,8 @@ The last one is 'home' referring to the initial plot.
 
 .. R22
 
-Following is an exercise that you must do.Please, pause the video and do the exercise. 
+Pause the video and do this exercise. Resume the video once done.
+
 
       Plot (sin(x)*sin(x))/x.
 
@@ -274,9 +287,9 @@ Let's revise quickly what we have learnt today
   1. To Start Ipython with pylab. 
   #. To Use the linspace function to create `num` equally spaced points in a region.
   #. To Find the length of sequnces using len function.
-  #. To Plot mathematical functions using plot.
-  #. To Clear drawing area using clf. 
-  #. To Use the UI of plot for studying it better and using functionalities like save,zoom and moving the plots on x and y axis. 
+  #. To Plot mathematical functions using plot function.
+  #. To Clear drawing area using clf function. 
+  #. Manipulate the plot in the window itself by using functionalities like save, zoom, move, home, arrow buttons. 
 
 .. L24