Change Y axis tick formatters in Python Matplotlib

Question

I have a graph over

[1,2,3,4,5]

with values that are quite small:

[0.000001,0.000002,...]

When I plot this, it shows the y axis ticks with the whole decimal. I would like something like

[1e-6,2e-6...]

to pop up instead. How can I do that?

matplotlib.ticker.ScalarFormatter has a scientific notation option: matplotlib.org/1.3.1/api/… You can define a ScalarFormatter and use it to provide string representations of floats, which you then set as ticklabels, if you don't like what it does on the axes. — cphlewis
– cphlewis, Commented Mar 12, 2015 at 2:32
Or, possibly better for your purposes, a FuncFormatter: stackoverflow.com/questions/20692503/… — cphlewis
– cphlewis, Commented Mar 12, 2015 at 2:50

ca_san · Accepted Answer · 2015-03-12 05:54:17Z

2

This is probably what you are looking for:

import matplotlib.pyplot as plt ...

plt.ticklabel_format(style='sci', axis='y', scilimits=(0,0))

style sci for scientific notation, axis y to format y axis only, m,n to include all numbers for which scientific notation should be applied (0,0 for all)

answered Mar 12, 2015 at 5:54

ca_san

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