How to define a color in matplotlib-plot?

Question

I tried the following example to draw a line with RGB color definition:

import matplotlib.pyplot as plt

ax = plt.axes()
ax.plot(0, 0, 0.5, 0.5, color='#FF0000')
plt.savefig('test.png')

but the resulting image was just blank! (Except the axes)

How to define a RGB color in a plot statement?

The line doesn't appear because you need to give at least 2 x and 2 y coordinates to draw a line. — DavidG
– DavidG, Commented Jan 16, 2018 at 19:37
@DavidG: Of course. I am stupid.... Create a simple answer to accept your solution.... — Alex
– Alex, Commented Jan 16, 2018 at 19:40

cwallenpoole · Accepted Answer · 2018-01-16 19:42:29Z

1

You're calling plot with incorrect arguments. X and y should be iterables:

ax.plot((0, 0), (0.5, 0.5), color='#FF0000')

answered Jan 16, 2018 at 19:42

cwallenpoole

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DavidG Over a year ago

Technically still wouldn't be able to see the line as the coordinates are the same, but I'm nust nitpicking :-)

DavidG · Accepted Answer · 2018-01-16 19:54:56Z

0

You are specifiy the color correctly, the problem is that you need at least 2 x, and 2 y coordinates to draw a line. The documentation can be found here.

ax.plot([0, 1], [0.5, 1], color='#FF0000')

Note: probably due to reducing down to a MCVE, but the coordinates also can't be the same as you can't draw a line from a point to itself

answered Jan 16, 2018 at 19:54

DavidG

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