Cmap in matplotlib Python

Question

I am trying to plot Mandelbrot set using matplotlib. I've done it with one color, but now i am trying to put in some cmap depending on number of iterations. So, my code looks like:

import random
import matplotlib.pyplot as plt


elem = 10000
x = []
y = []
colors = []

def iteration(x):
    n = 0
    result = 0
    while n < 1000: # max iterations
        result = pow(result, 2) + c
        if abs(result) > 2:
            return n           
        n += 1
    return n

for i in range(elem):
    c = complex(random.uniform(-2.5,1),random.uniform(-1.5,1.5))
    x.append(c.real)
    y.append(c.imag)
    colors.append(iteration(c))


plt.scatter(x, y, ',', c = colors, cmap= 'magma', vmin = 0, vmax = 1000)
plt.axis('equal')
plt.axis([-2,1,-1.5,1.5])
plt.title('Mandelbrot Set', y = 1.05)
plt.ylabel('Im')
plt.xlabel('Re')
plt.colorbar()
plt.show()

I am not sure how to define c, vmin and vmax in plt.scatter. I would like to have, for example if n is 1000 (max iteration) black dot and another color if n = 0.

Look this example matplotlib.org/devdocs//examples/showcase/mandelbrot.html — Serenity
– Serenity, Commented Dec 26, 2016 at 21:14

John Paul Qiang Chen · Accepted Answer · 2017-12-15 15:03:36Z

2

I do think your code works very well. Just need to define the marker.

plt.scatter(x, y, marker=',', c = colors, cmap= 'magma', vmin = 0, vmax = 1000)

answered Dec 15, 2017 at 15:03

John Paul Qiang Chen

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