accSumSq_ += avg*avg + dev*dev;
if (min < accMin_) accMin_ = min;
if (max > accMax_) accMax_ = max;
-// std::cerr << "! " << i_ << ' ' << avg << ' ' << dev << ' ' << accSum_ << ' ' << accSumSq_
-// << std::endl;
if (++i_ >= rank_) {
float accAvg (accSum_ / i_);
float accDev (std::sqrt(accSumSq_ / i_ - accAvg*accAvg));