Plot the max function with matplotlib

Question

I would like to plot the max function, but python's default max function can't take arrays, and I guess that's what matplotlib does under the hood.

So what is the correct syntax?

import matplotlib.pyplot as plt
import matplotlib.pylab as pylab

t = pylab.arange(-6, 6)
s = max(0,t)
plt.plot(t, s)
plt.show()

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

That's not what the error is... Please give the actual code. — Veedrac
– Veedrac, Commented Jun 13, 2014 at 14:19

Davidmh · Accepted Answer · 2014-06-13 14:25:13Z

1

np.max takes the maximum value of an array (or along a specific axis). What you want is np.maximum, that takes the greater value of two options:

In [3]: np.maximum(0, [-1,2,3])
Out[3]: array([0, 2, 3])

On the other hand, your error does not correspond to the code posted. np.max(0, t) raises a TypeError: only length-1 arrays can be converted to Python scalars because the second argument is the axis, and a scalar number has no dimensions.

answered Jun 13, 2014 at 14:25

Davidmh

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