On Fri, Nov 23, 2012 at 4:38 AM, Bob Dowling wrote:
> I have a simple function defined in the following snippet:
>
> --- start ---
> import numpy
>
> def chebyshev(x, m):
> '''Calculates Chebyshev functions of the first kind using the
> trigonometric identities.'''
>
> theta = numpy.w
> You may want to use this:
> http://docs.scipy.org/doc/numpy/reference/generated/numpy.piecewise.html
Thank you. That's just what I needed.
Works a treat:
--- start ---
import numpy
def chebyshev(x, m):
'''Calculates Chebyshev functions of the first kind using the
trigonometric identi
Bob Dowling cam.ac.uk> writes:
[clip]
> I'm guessing that numpy.where() is evaluating the complete arccos and
> arccosh arrays and therefore getting invalid arguments.
>
> Now, I can turn off the warnings with numpy.seterr(invalid='ignore') but
> that's not what I would regard as good practice.
I have a simple function defined in the following snippet:
--- start ---
import numpy
def chebyshev(x, m):
'''Calculates Chebyshev functions of the first kind using the
trigonometric identities.'''
theta = numpy.where(
numpy.abs(x)<=1.0,
numpy.arccos(x),
n
