scasum.f

          REAL FUNCTION SCASUM(N,CX,INCX)
    *     .. Scalar Arguments ..
          INTEGER INCX,N
    *     ..
    *     .. Array Arguments ..
          COMPLEX CX(*)
    *     ..
    *
    *  Purpose
    *  =======
    *
    *     takes the sum of the absolute values of a complex vector and
    *     returns a single precision result.
    *     jack dongarra, linpack, 3/11/78.
    *     modified 3/93 to return if incx .le. 0.
    *     modified 12/3/93, array(1) declarations changed to array(*)
    *
    *
    *     .. Local Scalars ..
          REAL STEMP
          INTEGER I,NINCX
    *     ..
    *     .. Intrinsic Functions ..
          INTRINSIC ABS,AIMAG,REAL
    *     ..
          SCASUM = 0.0e0
          STEMP = 0.0e0
          IF (N.LE.0 .OR. INCX.LE.0) RETURN
          IF (INCX.EQ.1) GO TO 20
    *
    *        code for increment not equal to 1
    *
          NINCX = N*INCX
          DO 10 I = 1,NINCX,INCX
              STEMP = STEMP + ABS(REAL(CX(I))) + ABS(AIMAG(CX(I)))
       10 CONTINUE
          SCASUM = STEMP
          RETURN
    *
    *        code for increment equal to 1
    *
       20 DO 30 I = 1,N
              STEMP = STEMP + ABS(REAL(CX(I))) + ABS(AIMAG(CX(I)))
       30 CONTINUE
          SCASUM = STEMP
          RETURN
          END