How to set unique colors for each line using matplotlib.pyplot format

Question

I'm having a lot of trouble trying to give each line in a chart I've produced to have a unique color. Matplotlib.pyplot function plt.errorbar() seems to cycle through 10 colors and repeats. My plot is generated using a for loop with a static x from a dataframe index and multiple y's from the dataframe columns:

fig = plt.figure()
for col in df_avg_diff.columns:
        plt.errorbar(x=df_avg_diff.index, y=df_avg_diff[col])
plt.show()

How would I alter this code to include color variation for every y? Thanks!

mysh · Accepted Answer · 2020-04-29 17:36:08Z

1

This is not an issue of the errorbar function, but rather the default color cycle (or, more generally, property cycle) of matplotlib. Check out this link for an example.

Probably the easiest way to get a different color for every line is to define them yourself, using any of the predefined colormaps - e.g. jet:

colors = plt.cm.jet(np.linspace(0, 1, n_columns))

This partitions the colormap range into the number of colors you need. Then you can either change the default property cycler to the newly created one or simply pass the color code for every line:

for i, col in enumerate(df_avg_diff.columns):
        plt.errorbar(x=df_avg_diff.index, y=df_avg_diff[col], color=colors[i])

answered Apr 29, 2020 at 17:36

mysh

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