用c语言编写了matlab中的extrema函数~ 功能 输出一个离散信号的极大值，极小值及其他们的位置~-C language extrema in matlab function to function great value, minimum value of output a discrete signal their location ~

利用离散点生成规则格网DEM，并利用MatLab生成的.dll来实现显示规则格网（三维）-Discrete point generating regular grid DEM, and use MatLab generated. Dll to the show rules grid (three-dimensional)