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En route vers la 4.4.1.

    1:       DOUBLE PRECISION FUNCTION DZASUM(N,ZX,INCX)
    2: *     .. Scalar Arguments ..
    3:       INTEGER INCX,N
    4: *     ..
    5: *     .. Array Arguments ..
    6:       DOUBLE COMPLEX ZX(*)
    7: *     ..
    8: *
    9: *  Purpose
   10: *  =======
   11: *
   12: *     DZASUM takes the sum of the absolute values.
   13: *
   14: *  Further Details
   15: *  ===============
   16: *
   17: *     jack dongarra, 3/11/78.
   18: *     modified 3/93 to return if incx .le. 0.
   19: *     modified 12/3/93, array(1) declarations changed to array(*)
   20: *
   21: *  =====================================================================
   22: *
   23: *     .. Local Scalars ..
   24:       DOUBLE PRECISION STEMP
   25:       INTEGER I,NINCX
   26: *     ..
   27: *     .. External Functions ..
   28:       DOUBLE PRECISION DCABS1
   29:       EXTERNAL DCABS1
   30: *     ..
   31:       DZASUM = 0.0d0
   32:       STEMP = 0.0d0
   33:       IF (N.LE.0 .OR. INCX.LE.0) RETURN
   34:       IF (INCX.EQ.1) THEN
   35: *
   36: *        code for increment equal to 1
   37: *
   38:          DO I = 1,N
   39:             STEMP = STEMP + DCABS1(ZX(I))
   40:          END DO
   41:       ELSE
   42: *
   43: *        code for increment not equal to 1
   44: *
   45:          NINCX = N*INCX
   46:          DO I = 1,NINCX,INCX
   47:             STEMP = STEMP + DCABS1(ZX(I))
   48:          END DO
   49:       END IF
   50:       DZASUM = STEMP
   51:       RETURN
   52:       END