I have a polygon and a surface that covers only part of this polygon (this is in 2-D x and y axis). Is there any way to delimit the surface by the polygon? I want only the part that is inside the polygon.
Without any sample data or illustrations it's mighty difficult to know exactly what you mean, but it sounds like inpolygon is the function you're looking for. Just feed it the x,y locations of your surface (generated by meshgrid) and it will tell you which corresponding surface locations are inside the polygon.