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Man Pages
HPL_idamax(3) HPL Library Functions HPL_idamax(3)

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

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

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

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.

#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);
 
}

HPL_daxpy (3), HPL_dcopy (3), HPL_dscal (3), HPL_dswap (3).
February 24, 2016 HPL 2.2

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