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HPL_dscal(3) HPL Library Functions HPL_dscal(3) NAME HPL_dscal - x = alpha * x. SYNOPSIS #include "hpl.h" void HPL_dscal( const int N, const double ALPHA, double * X, const int INCX ); DESCRIPTION HPL_dscal scales the vector x by alpha. ARGUMENTS N (local input) const int On entry, N specifies the length of the vector x. N must be at least zero. ALPHA (local input) const double On entry, ALPHA specifies the scalar alpha. When ALPHA is supplied as zero, then the entries of the incremented array X need not be set on input. X (local input/output) double * On entry, X is an incremented array of dimension at least ( 1 + ( n - 1 ) * abs( INCX ) ) that contains the vector x. On exit, the entries of the incremented array X are scaled by the scalar alpha. 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]; x[0] = 1.0; x[1] = 2.0; x[2] = 3.0; HPL_dscal( 3, 2.0, x, 1 ); printf("x=[%f,%f,%f]\n", x[0], x[1], x[2]); exit(0); return(0); } SEE ALSO HPL_daxpy (3), HPL_dcopy (3), HPL_dswap (3). HPL 2.3 December 2, 2018 HPL_dscal(3)
NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | EXAMPLE | SEE ALSO
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