# [Matrix-SIG] Power of trigs

**Dave Stinchcombe
**
dars@soton.ac.uk

*Thu, 19 Mar 1998 11:28:57 +0000 (GMT)*

Hi again,
This morning I needed to write a quick and easy root finder, so obviously I
grabbed Numeric Python.
I have a problem though. I wrote the line:
Numeric.power(Numeric.cos(phi),1-2*nus)
where nus is a constant of 0.3. phi is an array holding a list of values
I'm searching through. The problem comes that this line fails when phi is
greater than pi/2.
Now obviously this is due to the fact I'm trying to calculate a complex (or
at the very least an imaginary) number. But I want to. Can any one give
some suggestions as to how to cope, or in some way make python also believe
in complex numbers.
Yours
Dave