maintain state in between oct file calls

[Daniel Kottow]

i am not sure if this is an octave specific question, but it was under
matlab. suppose i have a compiled function (oct function) and want to
keep some data between successive calls to it. this may be useful if the
oct file needs a complex internal structure and you want to analyze
parts of it in the octave environment. i used to do neural networks this
way. then i could do the following:
octave:> backprop('init', init_param1, init_param2...);
octave:> backprop('train', training_data);
octave:> w = backprop('getWeights');
octave:> plot(w);
octave:> backprop('train')...
octave:> ...
octave:> backprop('clean'); 


just a suggestion. but how do you make backprop.oct keep its variables?
under matlab there were specific memory allocating functions, something
like matlab_static_alloc() which did the job (matlab would then be able
to clean up at the end of a session if the user didnt).
daniel



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