HPL_idamax man page

HPL_idamax — 1st k s.t. |x_k| = max_i(|x_i|).

Synopsis

#include "hpl.h"
 int HPL_idamax( const int N, const double * X, const int INCX );

Description

HPL_idamax returns  the index in an n-vector  x  of the first element having maximum absolute value.

Arguments

N       (local input)           const int

On entry, N specifies the length of the vector x. N  must  be at least zero.

X       (local input)           const double *

On entry,  X  is an incremented array of dimension  at  least ( 1 + ( n - 1 ) * abs( INCX ) )  that  contains the vector x.

INCX    (local input)           const int

On entry, INCX specifies the increment for the elements of X. INCX must not be zero.

Example

#include "hpl.h"
 int main(int argc, char *argv[])
{
  double x[3];
  int    imax;
  x[0] = 1.0; x[1] = 3.0; x[2] = 2.0;
  imax = HPL_idamax( 3, x, 1 );
  printf("imax=%d\n", imax);
  exit(0);
  return(0);
}

See Also

HPL_daxpy (3), HPL_dcopy (3), HPL_dscal (3), HPL_dswap (3).

Info

October 26, 2012 HPL 2.1 HPL Library Functions