Matplotlib color assignment error?

Question

I'm trying to make a colorful scatter plot based on data in an array:

plt.scatter(150, 93, c=y_pred)

Here, y_pred is:

array([ 5,  6,  8, 16, 21, 12, 12, 13,  6,  6, 17, 11,  6, 12, 12, 23,  6,
        6, 15,  6,  6,  6,  6,  6,  6, 23, 22,  6, 12, 17,  6, 20,  0,  6,
        6, 12, 12,  0,  6,  6,  6,  6,  6,  6,  5, 17,  6,  6, 11, 10, 13,
        6, 22, 24, 23,  6,  6, 13,  6,  6,  6, 12,  9, 15, 13, 14,  6, 18,
        1,  6,  9,  6,  6, 11,  6,  5, 16,  9, 23,  2, 14, 24,  9,  5,  9,
       10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,  1,  6, 19,  6, 23,  3,
       20, 10,  4,  8,  9,  6,  6,  9, 22, 23,  6,  6, 11,  6,  6,  6, 22,
       24, 14,  4,  7, 12,  6, 19,  6, 12,  3, 22,  6, 11,  6, 21, 23,  4,
        6,  6,  6,  4, 10, 22, 15,  6,  6, 18,  6, 14,  4,  5], dtype=int32)

This gives me an error:

ValueError: Invalid RGBA argument: 17

I don't understand why. The same solution works for others. Could you help me understand the error?

MSeifert · Accepted Answer · 2017-08-29 12:57:31Z

1

You only add one scatter point at x=150 ; y=93 but you try to assign 150 colors for this one value.

plt.scatter(150, 93)

It works if you pass in x and y that have the same shape as c:

plt.scatter(np.random.random(150), np.random.random(150), c=y_pred)

answered Aug 29, 2017 at 12:57

MSeifert

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