Unable to use fill_between in matplotlib basic ploting

Question

How to fill the following region:

(x < 100) & (y > 10)

import numpy as np, matplotlib.pyplot as plt

x = np.arange(0,255,0.1)
y = np.arange(0,255,0.1)

plt.plot(x,y)
plt.fill_between(range(0,100), range(10,100),color='r',alpha=.3)
plt.show()

ValueError: Argument dimensions are incompatible

nope!

Yup! range(0,100) and range(10,100) don't have the same dimensions. — Bart
– Bart, Commented Dec 4, 2015 at 12:10

Bart · Accepted Answer · 2015-12-04 12:23:14Z

1

I don't think that you need masked arrays for that.. I'm not sure if this completely matches your goal, but e.g.:

import matplotlib.pyplot as plt

x = np.arange(0,255,0.1)
y = np.arange(0,255,0.1)

plt.plot(x,y)
plt.fill_between(x, y1=10, y2=255, where=x<100)  
plt.show()

edited Dec 4, 2015 at 12:23

answered Dec 4, 2015 at 12:15

Bart

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8 Comments

Roman Over a year ago

its correct for the lower range, but not for upper range since it's not filling the rectangle region.

Bart Over a year ago

But with (x < 100) & (y > 10), what is the upper limit of y, and lower limit of x?

Roman Over a year ago

y between 10 and 255. x between 0 and 100.

Bart Over a year ago

plt.fill_between(x, y1=10, y2=255, where=x<100)?

Bart Over a year ago

But in that case, you might also simply draw a filled rectangle

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