This is a generic function to run a Convex program given by the string S.
The result of the computation can be stored in a file via the Option toFile.
i1 : callConvex("returnvalue:=convert(fvector(convhull([1,0],[0,1],[-1,0],[0,-1])),list);") o1 = {1, 4, 4, 1} o1 : List