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I am trying to do an errorplot with different marker-colors in python 2.7. Additionally I am including to line plots. I found a way here: matplotlib errorbar plot - using a custom colormap using a scatter plot for the colors and errorbar() for the bars.

As you can see in my example code, in the legend I always get one entry too much (just at the top). I cannot figure out, why. Tried to exclude it, which did not work. Did not find something helpful either, as I cannot really call the first legend entry.

Any ideas?

Here's my code:

import pandas as pd
import matplotlib.pyplot as plt
import numpy as np

%matplotlib inline


data = pd.DataFrame()
data['x'] = range(10)
data['y'] = data.x
data['err'] = .5
data['col'] = np.where(data.y<5,'r','b')

### setup 1-1 line
lin = pd.DataFrame()                            # setting 1-1 line
lin['x'] = range(10)
lin['y'] = range(10)

### setup 1-2 line
lin['x2'] = lin.x
lin['y2'] = lin.y

plt.errorbar(data.x, data.y, yerr = data.err, \
                   xerr = .3, fmt=' ', markersize=4, zorder = 1)
plt.scatter(data.x,data.y, marker='o', color = data.col, zorder = 2)
plt.plot(lin.x,lin.y,'g-')
plt.plot(lin.x2,1.8*lin.y2,'r-')
plt.legend(['','1-1 line', '1-1.8 line','holla','molla'], loc=4)

What I get is:

enter image description here

Thanks for your help!

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Robert
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1 Answers1

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To clean this whole thing up, I post a proper answer instead of comments. The problem could be solved by upgrading matplotlib from 1.3.1 to 1.5.1. Easy as that.

Robert
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