XSLP_EVALUATE

Evaluation strategy for user functions

Integer

0	use derivatives where possible;
1	always re-evaluate.

0

If a user function returns derivatives or returns more than one value, then it is possible for Xpress NonLinear to estimate the value of the function from its derivatives if the new point of evaluation is sufficiently close to the original. Setting XSLP_EVALUATE to 1 will force re-evaluation of all functions regardless of how much or little the point of evaluation has changed.

XSLPevaluatecoef, XSLPevaluateformula

XSLP_FUNCEVAL