CODEWITHSUNDEEP
pythonmatplotlibplotcolorstuples
usr_101
usr_101

Reputation: 11

Matplotlib specify color with a tuple

Matplotlib recognize color in many formats, including as a tuple. What's wrong with this code? Thanks.

import numpy as np
import matplotlib.pyplot as plt

data = []
for _ in xrange(2):
    data.append((np.random.rand(), np.random.rand()))
    data.append((np.random.rand(), np.random.rand()))
#    data.append('b')          # this works
#    data.append('0.5')        # this also works
    color = (0.1, 0.2, 0.3)
    data.append(tuple(color))  # this does not work

plt.plot(*data)
plt.show()

Upvotes: 1

Views: 1281

Answers (2)

Eric Conrad
Eric Conrad

Reputation: 11

I experienced the same problem. The cause of the problem is that the color tuple is being interpreted as data, which of course is what neither you nor I want. The workaround is to convert the color tuple to a color string.

from matplotlib.colors import to_hex  # convert to hex string
if not isinstance(color, str):
    color = to_hex(color)

In your case, include the import. Then change data append line:

    data.append(to_hex(color))

Upvotes: 0

nosklo
nosklo

Reputation: 223152

you're passing everything as data

so you're plotting this:

[
     (0.45, 0.36),
     (0.33, 0.78),
     (0.1,  0.2,  0.3),
]

You will get a value error, because your table of data has two values in the first two rows but three values in the third row.

Upvotes: 3

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