DERIV

DERIV, IR, IY, IX, --, Name, --, --, FACTA
Differentiates a variable.

IR: Arbitrary reference number assigned to the resulting variable (2 to NV (NUMVAR)). If this number is the same as for a previously defined variable, the previously defined variable will be overwritten with this result.
IY, IX: Reference numbers of variables to be operated on. IY is differentiated with respect to IX.
--: Unused field.
Name: Thirty-two character name for identifying the variable on printouts and displays. Embedded blanks are compressed for output.
--, --: Unused fields.
FACTA: Scaling factor (positive or negative) applied as shown below (defaults to 1.0).

Notes

Differentiates variables according to the operation:

IR = FACTA x d(IY)/d(IX)

Variable IX must be in ascending order.

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