NAME

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).