pyplot window doesn't plot things

Question

x=[[ 0.          0.00221864  0.00488273 ..., -0.03966467 -0.03691193  -0.03415696]]
y=[[  0.00000000e+00   5.00000000e-03   1.00000000e-02 ...,   7.06000000e+00, 
       7.06500000e+00   0.00000000e+00]]
plt.plot(x,y)  
plt.show()

The data both have 1415 columns.
Then the figure looks like the following
enter image description here

Why does it show nothing?
Thanks for answering!

ImportanceOfBeingErnest · Accepted Answer · 2017-03-13 08:48:08Z

1

You can't use nested lists to plot your data.
The following plots nothing

import matplotlib.pyplot as plt

x = [[1,2,3,4]]
y = [[2,3,1,4]]

plt.plot(x,y)
plt.show()

While this plots the values as expected.

import matplotlib.pyplot as plt

x = [1,2,3,4]
y = [2,3,1,4]

plt.plot(x,y)
plt.show()

answered Mar 13, 2017 at 8:48

ImportanceOfBeingErnest

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2 Comments

Mad Physicist Over a year ago

You can if x = [[1],[2],[3],[4]]; y = [[2],[3],[1],[4]]

Mad Physicist Over a year ago

The issue is that the length is computed from the outermost list. Notice that the axis limits are actually correct in the first case even though nothing shows up.

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