INTEGER FUNCTION IZAMAX(N,ZX,INCX)
INTEGER INCX,N
DOUBLE COMPLEX ZX(*)
DOUBLE PRECISION SMAX
INTEGER I,IX
DOUBLE PRECISION DCABS1
EXTERNAL DCABS1
IZAMAX = 0
IF (N.LT.1 .OR. INCX.LE.0) RETURN
IZAMAX = 1
IF (N.EQ.1) RETURN
IF (INCX.EQ.1) GO TO 20
IX = 1
SMAX = DCABS1(ZX(1))
IX = IX + INCX
DO 10 I = 2,N
IF (DCABS1(ZX(IX)).LE.SMAX) GO TO 5
IZAMAX = I
SMAX = DCABS1(ZX(IX))
5 IX = IX + INCX
10 CONTINUE
RETURN
20 SMAX = DCABS1(ZX(1))
DO 30 I = 2,N
IF (DCABS1(ZX(I)).LE.SMAX) GO TO 30
IZAMAX = I
SMAX = DCABS1(ZX(I))
30 CONTINUE
RETURN
END