DOUBLE PRECISION FUNCTION DZSUM1( N, CX, INCX ) INTEGER INCX, N COMPLEX*16 CX( * )
DZSUM1 takes the sum of the absolute values of a complex vector and returns a double precision result. Based on DZASUM from the Level 1 BLAS. The change is to use the 'genuine' absolute value. Contributed by Nick Higham for use with ZLACON.
N (input) INTEGER The number of elements in the vector CX. CX (input) COMPLEX*16 array, dimension (N) The vector whose elements will be summed. INCX (input) INTEGER The spacing between successive values of CX. INCX > 0.