Weird matplotlib color issue when plotting line

Question

I might be missing something very obvious here, but I've tried numerous combinations I haven't been able to find the reason for this behavior.

I'm running Python v2.7.6 and matplotlib v1.4.3.

I have a simple plot:

import matplotlib.pyplot as plt
import numpy as np
x, y = np.random.random(50), np.random.random(50)
plt.plot(x, y, c='red', ls='-', lw=1., label='a', zorder=2)
plt.show()

Notice that the color is supposed to be red as per c='red'. What I get instead is:

If I use the full name of the argument color='red', the line is red as it should. If I remove any of the arguments after c='red', e.g.:

plt.plot(x, y, c='red', ls='-', lw=1., label='a')
plt.plot(x, y, c='red', ls='-', lw=1., zorder=2)
plt.plot(x, y, c='red', ls='-', label='a', zorder=2)
plt.plot(x, y, c='red', lw=1., label='a', zorder=2)

the plotted line is also red.

Am I doing something very obviously wrong here or did I stumble into a weird issue?

Add:

Using:

plt.plot(x, y, c='r', ls='-', lw=1., label='a', zorder=2)

as proposed (i.e.: c='r' instead of c='red') has no effect on my system, I still get the blue line.

Writing c='r' changes nothing in my system, I still get a blue line. — Gabriel
– Gabriel, Commented Oct 5, 2015 at 19:46
@FreddieV4 it should work just fine with c='red'. Notice that it works when one of the arguments is taken away. Also, it's in the docs. "Finally, legal html names for colors, like ‘red’, ‘burlywood’ and ‘chartreuse’ are supported." — SirParselot
– SirParselot, Commented Oct 5, 2015 at 19:49

Leb · Accepted Answer · 2015-10-05 20:31:08Z

1

The following information work with Python 3.x and matplotlib 1.4.3

c='r' found in docs

import matplotlib.pyplot as plt
import numpy as np
x, y = np.random.random(50), np.random.random(50)
plt.plot(x, y, c='r', ls='-', lw=1., label='a', zorder=2)
plt.show()

As it seems color='red' and color='r' seem to work along with c='r'. c='red' does not change the line color.

edited Oct 5, 2015 at 20:31

answered Oct 5, 2015 at 19:43

Leb

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9 Comments

Gabriel Over a year ago

Nope, this has no effect on my system. what versions of Python and matplotlib are you running?

SirParselot Over a year ago

Also in the docs. "Finally, legal html names for colors, like ‘red’, ‘burlywood’ and ‘chartreuse’ are supported."

Leb Over a year ago

Python 3.4. c='red' doesn't work for me, c=r does. Running same version of mpl as you.

Leb Over a year ago

try color='red' or color='r'

Gabriel Over a year ago

@Leb as I said in the question, I already know that using color='red' works and as I've commented above, using c='r' has no effect on my system. Perhaps its something that was fixed in v3 of Python.

|

Gabriel · Accepted Answer · 2015-10-06 04:14:13Z

0

This is a known issue and the fix will be released with v1.5.0.

See issue at Github for more details: https://github.com/matplotlib/matplotlib/issues/5197

answered Oct 6, 2015 at 4:14

Gabriel

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