matplotlib bar plot adjust bar direction

Question

I want to start the bars from the bottom. How can I change the starting point from zero to e.g. -2 ?

My code:

import matplotlib.pyplot as plt
import numpy as np


N=1000
sample=np.random.random_integers(1,10,N)
hist,bins=np.histogram(sample)

plt.bar(bins[:-1],np.log10(1.*hist/N),np.diff(bins))

plt.show()

Output: enter image description here

Sorry, removed the commentary because I realized of another thing. I think you'll find that it did change, but just slightly. — Jblasco
– Jblasco, Commented May 27, 2015 at 11:39

hardythe1 · Accepted Answer · 2015-05-27 11:34:27Z

1

Try This:

plt.bar(bins[:-1],abs(np.log10(1.*hist/N)),np.diff(bins))

answered May 27, 2015 at 11:34

hardythe1

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3 Comments

Andy Over a year ago

I want to keep the y-axis labels as they are, because it's the logarithm

Jblasco Over a year ago

Hardythe1 is on the right track. Now just add bottom=-2 within the plt.bar()

Andy Over a year ago

thx! this worked now: plt.bar(bins[:-1],2-abs(np.log10(1.*hist/N)),np.diff(bins),bottom=-2)

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