izamax(3P) Sun Performance Library izamax(3P)NAMEizamax - return the index of the element with largest absolute value.
SYNOPSIS
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);
PURPOSEizamax 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.
ARGUMENTS
N (input)
On entry, N specifies the number of elements in the vector.
N must be at least one for the subroutine 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.
NOTES
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 containing the largest absolute value.
6 Mar 2009 izamax(3P)