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HPL_idamax(3)                HPL Library Functions               HPL_idamax(3)


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).

HPL 2.1                        October 26, 2012                  HPL_idamax(3)

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