Matplotlib is plotting multiple labels

Question

I have matrix A of size 50x4 and another matrix B of size 4*2

import numpy as np
import matplotlib.pyplot as plt

plt.plot(np.dot(A, B), [0]*A.shape[0], "bo", label="Tennis")

plt.legend()
plt.show()

enter image description here

How to make matplotlib display the label name only once?

I can't recreate this issue. Are you sure you aren't calling plt.plot again on a different data set (or the same data set) with the same label? — ebarr
– ebarr, Commented Apr 5, 2014 at 8:43

sebix · Accepted Answer · 2014-04-05 09:16:33Z

2

Because you have 2 columns of data.

import numpy as np
import matplotlib.pyplot as plt

A=np.random.rand(50, 4)
B=np.random.rand(4, 2)
C=np.dot(A, B)
D=[0]*A.shape[0]
plt.plot(C, D, "bo", label="Tennis")

plt.legend()
plt.show()

C has now shape (50, 2) and D has shape (50,)

>>> C.shape
(50, 2)
>>> np.shape(D)
(50,)

The Documentation on plt.plot says:

If x and/or y is 2-dimensional, then the corresponding columns will be plotted.

I would recommend you to fix this by reducing the data to one column using C.flatten() and changing the dimension of D accordingly.

answered Apr 5, 2014 at 9:16

sebix

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