[Gsll-devel] simulated-annealing

[James Wright]

Hi,

I've run into a couple of problems trying to get
simulated-annealing-examples to run; they both have to do with the
sample generic function.

The first problem is that trivial-example-step calls sample with
'uniform as an argument instead of :uniform.  I've attached a patch to
fix this (although a patch is probably overkill since it's such a
trivial fix).

The second problem is trickier, and I don't quite know what to do
about it.  Basically, only the mpointer of the random-number-generator
that is passed to simulated-annealing is passed through to
simulated-annealing-int, which means that only the mpointer is passed
to trivial-example-step.  This results in an error when
trivial-example-step tries to call sample on the passed-in mpointer,
because sample only has methods defined for random-number-generators.

I tried changing sa-step-function to wrap the mpointer in a
random-number-generator before passing it through to the
user-step-function, but that seems to cause memory problems (I think
the wrappers free the underlying random number generator too many
times when they get garbage-collected).

Has this sort of problem been fixed elsewhere in the codebase?  If
not, does anyone have any ideas about how to fix this?

Thanks,
      James
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