Dynamic Computation of Derivatives It is shown how Wengert's procedure for computation of derivatives can be implemented conveniently by use of compiler-generated complex addition, subtraction, and linkage to complex arithmetic subroutines. Evaluation of a function and derivative proceed in parallel, as in Wengert's procedure, but with the "imaginary" parts of variables declared complex bearing the values of the derivatives of the real parts. This technique provides a simple way to compute the derivatives of a function, without the need for deriving and programming the evaluation of explicit formulas for the derivatives. CACM September, 1967 Lesk, A. M. CA670908 JB February 27, 1978 3:11 PM 1028 4 1536 1216 4 1536 1278 4 1536 1347 4 1536 1396 4 1536 1536 4 1536 1029 5 1536 1536 5 1536 1536 5 1536 1536 5 1536