Check 1st Order Derivatives

Type : Integer

Range : {-1..:ref:Miscellaneous_Maxint }

Default : 0

This options controls how often the derivatives are tested. Debugging of derivatives is normally only relevant for user-written functions in external equations. Possible values are:

0

No debugging.

-1

The derivatives are tested in the initial point only.

+n

The derivatives are tested in all iterations that can be divided by n, provided the derivatives are computed in this iteration. (During phase 0, 1, and 3 derivatives are only computed when it appears to be necessary.)

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