Speed Issues

[Brian Gough]

David Ronis writes:
 > I've also tried the IMSL routine ZSPOW (written in fortran from an
 > early version of the IMSL library).  As I mentioned at the outset, the
 > gsl version is about 30% slower, although the two give identical
 > roots.

Hi,

Before I look into this you're refering to the the speed per function
evaluation (or iteration) being 30% slower, not total runtime, and
ZSPOW is the same Powell scaled-hybrid algorithm?

regards

-- 
Brian Gough

 > P.S., it doesn't seem to be in the documentation, but is there any
 > convention as to what the initial stride of a gsl_vector is?  When can
 > I assume that it's 1 and will remain so?

Yes, it's  assumed to be 1 if you use gsl_vector_alloc.