zettzet / plotcp Goto Github PK

Add key word argument polar: bool = False (by default)
If True:

1. draws polar grid parametrization(transformed, origin or both correspond to faxis value) instead of cartesian
2. Reim.REAL is for rays from origin, Reim.IMAG is for arcs of circles
3. grid_step = (n, m) means ‘every 2pi/n rad will be a ray; every mk cm will be a circle radius m*k’

Your main example

from plotcp import plotcp
import matplotlib.pyplot as plt

def f(z):
    return (z+1) / z

plotcp(f, (-4, 4), (-4, 4))
plt.show()

seems to produce wrong output. Note that f has a root at z=-1 and a pole at z=0. None of this is seen in the plot, it's more like +1 is a point where something happens:

cplot, a package of mine for the same purpose, seems to get it right:

import cplot

cplot.show(f, (-4, 4), (-4, 4))