How to plot complex numbers (Argand Diagram) using matplotlib
complex-numbers, matplotlib, numpy, plot, python
Solution
I'm not sure exactly what you're after here...you have a set of complex numbers, and want to map them to the plane by using their real part as the x coordinate and the imaginary part as y?
If so you can get the real part of any python imaginary number with `number.real` and the imaginary part with `number.imag`. If you're using numpy, it also provides a set of helper functions numpy.real and numpy.imag etc. which work on numpy arrays.
So for instance if you had an array of complex numbers stored something like this:
In [13]: a = n.arange(5) + 1j*n.arange(6,11)
In [14]: a
Out[14]: array([ 0. +6.j, 1. +7.j, 2. +8.j, 3. +9.j, 4.+10.j])
...you can just do
In [15]: fig,ax = subplots()
In [16]: ax.scatter(a.real,a.imag)
This plots dots on an argand diagram for each point.
edit: For the plotting part, you must of course have imported matplotlib.pyplot via `from matplotlib.pyplot import *` or (as I did) use the ipython shell in pylab mode.
Problem
I'd like to create an Argand Diagram from a set of complex numbers using matplotlib. Are there any pre-built functions to help me do this? Can anyone recommend an approach? Image by LeonardoG, CC-SA-3.0