[VEX] remove-point-prim , How to write these in VEX?

------- point
int  removepoint(int geohandle, int point_number)
int  removepoint(int geohandle, int point_number, int andprims)

ex). removepoint(0, @ptnum);

------- primitive
int  removeprim(int geohandle, int prim_number, int andpoints) 

ex). removeprim(0, @primnum, 1);