I figured it out. I just use expression substitution and numeric evaluation, I do not use "csrc_double" to a string. Matei Matei Stroila wrote:

Hello,

Here is what I would like to do and I need a piece of advice on this. I want to use ginac to compute the gradient of a function so that I can use this gradient for the conjugate gradient method in gsl (the GNU scientific library). I succesfully computed the gradient and I can output its expression with "csrc_double" to a string. How can I use this expression in the definiton of a function at runtime?

I guess other people had this problem too, to use a CAS library in conjuction with a numeric library, at runtime.

Thanks a lot for any suggestion,

Matei

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