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problem plotting on logscale in matplotlib in python

开发者 https://www.devze.com 2022-12-27 17:09 出处:网络
I am trying to plot the following numbers on a log scale as a scatter plot in matplotlib.Both the quantities on the x and y axes have very different scales, and one of the variables has a huge dynamic

I am trying to plot the following numbers on a log scale as a scatter plot in matplotlib. Both the quantities on the x and y axes have very different scales, and one of the variables has a huge dynamic range (nearly 0 to 12 million roughly) while the other is between nearly 0 and 2. I think it might be good to plot both on a log scale.

I tried the following, for a subset of the values of the two variables:

fig = plt.figure(figsize=(8, 8))
ax = fig.add_subplot(1, 1, 1)
ax.set_yscale('log')
ax.set_xscale('log')
plt.scatter([1.341, 0.1034, 0.6076, 1.4278, 0.0374],
        [0.37, 0.12, 0.22, 0.4, 0.08])

The x-axes appear log scaled but the points do not appear -- only two points appear. Any idea how to fix this? Also, how can I make this log scale appear on a square 开发者_运维百科axes, so that the correlation between the two variables can be interpreted from the scatter plot?

thanks.


I don't know why you only get those two points. For this case, you can manually adjust the limits to make sure all your points fit. I ran:

import matplotlib.pyplot as plt

fig = plt.figure(figsize=(8, 8)) # You were missing the =
ax = fig.add_subplot(1, 1, 1)
ax.set_yscale('log')
ax.set_xscale('log')
plt.scatter([1.341, 0.1034, 0.6076, 1.4278, 0.0374],
        [0.37, 0.12, 0.22, 0.4, 0.08])
plt.xlim(0.01, 10) # Fix the x limits to fit all the points
plt.show()

I'm not sure I understand understand what "Also, how can I make this log scale appear on a square axes, so that the correlation between the two variables can be interpreted from the scatter plot?" means. Perhaps someone else will understand, or maybe you can clarify?


You can also just do,

plt.loglog([1.341, 0.1034, 0.6076, 1.4278, 0.0374], 
                     [0.37, 0.12, 0.22, 0.4, 0.08], 'o')

This produces the plot you want with properly scaled axes, though it doesn't have all the flexibility of a true scatter plot.

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