{
std::transform(arrPtr+i*nbOfCompo,arrPtr+(i+1)*nbOfCompo,(double *)tmp,std::bind2nd(std::multiplies<double>(),volPtr[i]));
std::transform((double *)tmp,(double *)tmp+nbOfCompo,res,res,std::plus<double>());
{
std::transform(arrPtr+i*nbOfCompo,arrPtr+(i+1)*nbOfCompo,(double *)tmp,std::bind2nd(std::multiplies<double>(),volPtr[i]));
std::transform((double *)tmp,(double *)tmp+nbOfCompo,res,res,std::plus<double>());