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[Help-gsl] simulated annealing

From: Carl Boettiger
Subject: [Help-gsl] simulated annealing
Date: Thu, 30 Apr 2009 01:22:55 -0700


I am finding strange behavior in the simulated annealing package.  I
have modified the trivial example so that the state space can be
represented as a structure, rather than a single double value.  This
is crucial for me as I need to pass my objective function that i am
trying to minimize several different parameters of different types.
This works fine for the trivial structure of one element.  However, as
soon as I add another element to the structure _ahead_ of the element
I am varying to minimize my objective function, the routine fails.  It
prints out a fixed and meaningless value in place of the variable I am
trying to minimize.  If the structure is defined in the other order,
this does not happen.

I've attached the code.  I have no idea why I get this behavior.  If
anyone has an example function that calls the simulated annealing
package using a statespace that is not a single value or array, I'd
appreciate it too.  Thanks for your insights,

Carl Boettiger
Population Biology, UC Davis

Attachment: siman_test.c
Description: Text Data

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