why my scatter plot shows no color?

Question

I am working on scattering plot using matplotlib and just simply testing several sample codes, but cannot show colors. Only showing gray. For example:

import numpy as np import matplotlib.pyplot as plt x = np.random.rand(100) y = np.random.rand(100) t = np.arange(100) plt.scatter(x, y, c=t) plt.show()

This is the exactly same as this previous question about scatterplots and color mapping. See the execution result:

Screenshot of results

What's wrong with my setup? I am using Jupyter python 3.x version.

Thanks!

Perhaps this will help: stackoverflow.com/questions/12236566/… — Jujunol
– Jujunol, Commented Apr 16, 2016 at 22:38
It shows colors to me. The question is why should it work? To set colors you should pass tuples of three. To set gray you should set a number between 0 and 1, but pass it as a string. So that command c=t is not really clear to me. Try cmap=plt.cm.hot inside the scatter command. It could be that you have cm.gray set earlier, and need to refresh the kernel. — roadrunner66
– roadrunner66, Commented Apr 16, 2016 at 23:30
Thank you! Using 'cmap=plt.cm.hot' and 'camp = pt.cm.jet both' work — TripleH
– TripleH, Commented Apr 17, 2016 at 0:26

heltonbiker · Accepted Answer · 2016-04-16 23:31:51Z

You can try to force a specific colormap:

plt.scatter(x, y, c=t, cmap=plt.cm.jet)

Also, as a bonus, you could colorize it more:

plt.scatter(x, y, c=t, cmap=plt.cm.jet, s=30, linewidths=0, alpha=0.7) # "s" is for (marker)"size"

I cannot properly "test" it because your original code works for me.

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