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| static variables [message #8894] |
Wed, 30 April 1997 00:00 |
Jonathan Rogness
Messages: 7
Registered: April 1997
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Junior Member |
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Hello,
I've been playing around with the POWELL minimization routine in IDL
(version 4.0). In a nutshell, I've got a model with four parameters,
and I need to solve those parameters so that the error of the model
compared to real world measurements is minimized.
This leads to a problem: my object function simply computes the error
for a given bunch of parameters, but to do this the function needs to
have access to 30+ measurements from a file. I'd rather not read in the
file every time the function is called.
I started out writing in C and using the NAG minimization routines, but
since the calling routines were in IDL I thought it would be nice to
stay in one language. In C the problem was solved by using static
variables; I could use a function to read in the measurements, and every
time it was called subsequently it would remember the previous values.
I haven't run across anything like that in IDL.
Any tips/suggestions/thoughts on how to do this would be greatly
appreciated. Sorry if it's a little vague - I don't want to bore
anybody with the details unless it's absolutely necessary. ;-)
Jonathan Rogness
rogness@sg1.cr.usgs.gov
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