NAME¶

DZSUM1 - takes the sum of the absolute values of a complex vector and returns a double precision result

SYNOPSIS¶

DOUBLE PRECISION

FUNCTION DZSUM1( N, CX, INCX )

INTEGER INCX, N COMPLEX*16 CX( * )

PURPOSE¶

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.

ARGUMENTS¶

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.