如何在Octave / Matlab中绘制网格（在z上具有强度轮廓）Nx3矩阵？

I have got a data that are in a matrix of size N rows by 3 columns, each column corresponds to particular point in x, y and z axis. The data in that matrix have already been pre generated so my task is to plot it in a mesh as this is faster than creating the same plot with scatter function requiring 1M data points just to look similar.I have got a data that are in a matrix of size