isamax(3P) Sun Performance Library isamax(3P)NAMEisamax - return the index of the element with largest absolute value.
SYNOPSIS
INTEGER FUNCTION ISAMAX(N, X, INCX)
INTEGER N, INCX
REAL X(*)
INTEGER*8 FUNCTION ISAMAX_64(N, X, INCX)
INTEGER*8 N, INCX
REAL X(*)
F95 INTERFACE
INTEGER FUNCTION IAMAX([N], X, [INCX])
INTEGER :: N, INCX
REAL, DIMENSION(:) :: X
INTEGER(8) FUNCTION IAMAX_64([N], X, [INCX])
INTEGER(8) :: N, INCX
REAL, DIMENSION(:) :: X
C INTERFACE
#include <sunperf.h>
int isamax(int n, float *x, int incx);
long isamax_64(long n, float *x, long incx);
PURPOSEisamax return the index of the element in x with largest absolute value
where x is an n-vector.
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 floating point numbers and one or more NaNs, the routine
returns the index of the element containing the largest absolute value.
6 Mar 2009 isamax(3P)
