void meshgrid(const Range &xgv, const Range &ygv, Mat &X, Mat &Y, int Unit)
{
std::vector<double> t_x, t_y;
for (int i = xgv.start; i <= xgv.end; i = i + Unit) t_x.push_back(i);
for (int j = ygv.start; j <= ygv.end; j = j + Unit) t_y.push_back(j);
cv::repeat(cv::Mat(t_x).t(), t_y.size(), 1, X);
cv::repeat(cv::Mat(t_y), 1, t_x.size(), Y);
}
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