varspace(funx,xmin,​xmax,numx,varargin)

When exporting complex curves with regions of interest and others without, it becomes useful to adaptivley query the domain of the function as opposed to evenly distributing the point density via linspace. When adaptivley adjusting the spacing of the representative domain, fewer points can be used as opposed to an evenly distributed domain for equivalent representation.
In the example, the curve sin(x) is fairly linear about x=0 and accordingly fewer points are sample along this region whereas at x = +/- pi/2, more points are samples to account for the curvature.