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[Help-gsl] multimin: gsl_multimin_fdfminimizer_iterate( ) set variables

From: kevin
Subject: [Help-gsl] multimin: gsl_multimin_fdfminimizer_iterate( ) set variables and value of target function to "NaN"
Date: Sat, 19 Jun 2010 23:16:19 +0800


I'm using the conjugate_fr algorithm in an optimization problem, 

However, after the program executes the function "
gsl_multimin_fdfminimizer_iterate (s)" , 

all the variables "x" (i.e.gsl_vector_get (s->x, k)) and the value of target
function (i.e. s->f ) are set to NaN, and they remain NaN in the following

Does anyone know what is the potential problem ? 

My target function includes digamma fuction, which is taylor approximation
of first derivative of the log gamma function. I guess maybe it cause the

If anyone who like to help me need my primary code, please contact me!


Thanks all,








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