I say in my documentation to look at the end of the relevant files for examples. In this case, see the file numerical-differentiation.lisp, http://trac.common-lisp.net/gsll/browser/trunk/numerical-differentiation.lis... (defun-single 3/2-power (x) (expt x 3/2)) (central-derivative 3/2-power 2.0d0 1.d-8) Liam On Thu, Oct 2, 2008 at 12:35 PM, Zach <elzacho@gmail.com> wrote:

Hey Liam et al.

I wanted to use the numerical differentiation functions of GSL (specifically gsl_deriv_central or the GSLL equiv CENTRAL-DERIVATIVE). Does anyone have some examples of it's usage?

i have tried this with my home brewed GSL bindings. However, it is a bit trickier than most stuff I have played with since it involves a callback function. The callback must be placed in a slot of a gsl_function object. Both of these steps seem trivial enough, but I am getting some memory error that I am having trouble debugging (bringing back old nightmares of C).

Anyway, thanks for reading, Zach

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