As Patrick suggested, this approach should really be extended to multivariate functions. To cite but one example, I recently attended a conf where Pr. Prevost (Princeton) talked about non-linear finite elements calcs. The long standing approach had always been to implement the analytical expressions tangent stiffness (which is nothing but a jacobian matrix). He argued strongly against it for at least two reasons - it is error-prone, - most of the time, the expressions are so complex that their evaluation is just as time-consuming as a numerical derivative. So, having some robust algorithms for multidimensional functions already implemented in CM would in my view be invaluable. Sébastien
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