isamax (3p)

Name

isamax - 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);

Description

Oracle Solaris Studio Performance Library                           isamax(3P)



NAME
       isamax - 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);



PURPOSE
       isamax 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.



                                  7 Nov 2015                        isamax(3P)