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Powell's ghost [message #7194]

Thu, 03 October 1996 00:00

Mark Fardal
Messages: 51
Registered: October 1995

Member

Hi,

I've been using the Numerical Recipes routine POWELL to do some parameter
fitting. At first it worked nicely, but lately I've been having
problems with it--it's not necessarily converging to a global minimum,
and I'm not sure whether the problem is in my function or in Powell
itself. Also, it tends to spend a long time (~10 successive calls)
on parameter choices that are identical to 7 decimal places.
So I thought I would look at the source code. I have to call it
with nr_powell, not powell (as the on-line help indicates), so I've been
looking for both names.

Unfortunately, I couldn't find the source code anywhere in the directories
listed in my IDL_PATH. And when I try help,/source_files or
help,/routines, it doesn't show up anywhere either. So is the routine
a figment of my imagination, or what?

I'm using IDL 4.0.1 on a Sun Ultra-1, with Solaris 2.5.1.

Mark Fardal
University of Colorado

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Powell's ghost

By: Mark Fardal on Thu, 03 October 1996 00:00

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