fnvdotpr_f64→doubledouble vdotpr_f64(const double * a, const double * b, int n)sourceeditDouble-precision dot product. Uses vDSP_dotprD.References Accelerate.framework vDSP_dotprD.Parametersa, bconst double*Input vectors.nstd::size_tElement count.ReturnsdoubleScalar inner product.