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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). HPL 2.1 October 26, 2012 HPL_idamax(3)

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