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5.1.1 The Values and Derivatives Required

It is assumed that a nonlinear group type i s specified in terms of its group-type variable as described on a GROUP TYPE data card in an SDIF file, see Section 3.2.17. An optimization procedure is likely to require the values of the group functions and their first and second derivatives (taken with respect to the variable). We now describe how to set up the data for a given problem.