Make sure the arguments of the TOPER command are correctly passed. For example, when you use ADD as the operation it will be performed as follows; ParR(i,j,k) = FACT1Par1(i,j,k) + FACT2 *Par2(i,j,k) +CON1 Also, it is necessary for both the parameters (ie Par1 and Par2) to have the same dimensions and the same variable names corresponding to those dimensions. Par1 and Par2 must also have identical index values for rows, columns, etc.
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