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Diffstat (limited to 'using_plot_interactively/script.rst')
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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 |