When I run the following code
load “medit”
mesh Th=square(10,10,[2x-1,2y-1]);
fespace Vh(Th,P1);
Vh u=2-xx-yy;
medit(“mm”,Th,u);
I get a back and white flat triangulated square, but the manual mentioned that this code should generate a colorful surface.
I and using freefem++ on Linux.