Too many subscripts for einstein sum

[e-eight]

Hi Nico,

I wanted to use quadpy for my integrations. I tried the line_integral example given in the readme. It gives me a ValueError: einstein sum subscripts string contains too many subscripts for operand 0.
I am not sure what is going wrong. Any ideas?

Thanks.

[nschloe]

I'm guessing your function spits out the wrong data shape. Can you provide a minimal example?

[e-eight]

It is literally the line_segment example in the readme file.

val = qp.line_segment.integrate(lambda x: np.exp(x), [0.0, 1.0], qp.line_segment.GaussPatterson(5))

[nschloe]

Cannot reproduce. This

import quadpy
import numpy as np

val = quadpy.line_segment.integrate(
    lambda x: np.exp(x),
    [0.0, 1.0],
    quadpy.line_segment.GaussPatterson(5)
    )

print(val)

gives

1.7182818284588917

on my machine. (The exact value is exp(1) - exp(0) which is approximately 1.718281828459045, so this is correct.)

[e-eight]

I see. This is the error that I am getting.

[nschloe]

Looks very much like an error in your numpy installation.

[e-eight]

Edit: Tried it again after restarting ipython. And it worked this time. Got the same answer as you. Possibly some numpy issue. Thanks for looking in to it.