COMPUTE DERIVATIVE
Keywords: sic

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COMPUTE DERIVATIVE

            [SIC\]COMPUTE OutVar DERIVATIVE InVar

        Compute the derivative of the InVar variable, in  the  classical  sense,
        i.e.
          OutVar[i] = InVar[i+1]-Invar[i]
        InVar  and OutVar are assumed to be 1-D variables, of size N.  OutVar[N]
        is linearly extrapolated from the N-1 and N-2 values.