Contents
izamax - return the index of the element with largest abso-
lute value.
INTEGER FUNCTION IZAMAX(N, X, INCX)
DOUBLE COMPLEX X(*)
INTEGER N, INCX
INTEGER*8 FUNCTION IZAMAX_64(N, X, INCX)
DOUBLE COMPLEX X(*)
INTEGER*8 N, INCX
F95 INTERFACE
INTEGER FUNCTION IAMAX([N], X, [INCX])
COMPLEX(8), DIMENSION(:) :: X
INTEGER :: N, INCX
INTEGER(8) FUNCTION IAMAX_64([N], X, [INCX])
COMPLEX(8), DIMENSION(:) :: X
INTEGER(8) :: N, INCX
C INTERFACE
#include <sunperf.h>
int izamax(int n, doublecomplex *x, int incx);
long izamax_64(long n, doublecomplex *x, long incx);
izamax return the index of the element in x with largest
absolute value where x is an n-vector and absolute value is
defined as the sum of the absolute value of the real part
and the absolute value of the imaginary part.
N (input)
On entry, N specifies the number of elements in
the vector. N must be at least one for the sub-
routine to have any visible effect. Unchanged on
exit.
X (input)
( 1 + ( n - 1 )*abs( INCX ) ). On entry, the
incremented array X must contain the vector x.
Unchanged on exit.
INCX (input)
On entry, INCX specifies the increment for the
elements of X. INCX must be positive. Unchanged
on exit.
If the vector contains all NaNs, the function returns 1. If
the vector contains valid double complex numbers and one or
more NaNs, the routine returns the index of the element con-
taining the largest absolute value.