Plotting in Pylab

The Open source Python libraries available are:

  • NumPy adds vectors, matrices, and many high-level mathematical functions
  • Scipy adds mathematical classes and functions useful to scientists
  • MatPlotLib adds an object-oriented API for plotting
  • PyLab combines the other libraries to provide a MATLAB-like interface

Pylab commands:

1. pylab.figure(1) :-> gives the figure name

2. pylab.plot() :-> produces the plot

  • The first two arguments to pylab.plot must be sequences of the same length.
  • First argument gives x-coordinates.
  • Second argument gives y-coordinates.

3. pylab.show() :-> displays the plot on output screen

Example :

screen-1

Note : pylab.figure() should contain number or variable as argument. When tried to give string as argument, it gave below error:

NameError Traceback (most recent call last)
C:\Users\ananth\Documents\6.00.2x Files\plot.py in <module>()
1 import pylab
—-> 2 pylab.figure(sample)
3 pylab.plot([1,3,5,7],[2,4,6,8])
4 pylab.show()

NameError: name ‘sample’ is not defined

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