matplotlib legend not showing

Question

I have two numpy datasets and trying to make two figures ( each figure including two datasets).

The legend does not show up on both figures. I´d appreciate if someone

Answer 1

When you say "I can not manage to make legend work" I am assuming you mean that no legend is showing up.

Consider the example code which is a very simple example of plotting a histgoram like you are trying to do:

import numpy as np
import matplotlib.pyplot as plt

data = np.random.randint(0,10,(1000))

fig,ax = plt.subplots()
ax.hist(data,bins=10,edgecolor='black')

ax.legend()

plt.show()

This will draw the figure correctly, however there should be a warning in your console saying

C:\Python27\lib\site-packages\matplotlib\axes_axes.py:545: UserWarning: No labelled objects found. Use label='...' kwarg on individual plots. warnings.warn("No labelled objects found. "

This is telling you to use label= in your ax.hist()

So if we include that:

ax.hist(data,bins=10,edgecolor='black',label="Entry 1")

We get the following graph: