// After a stacksize problem (lack of memory) during a surface plot, it is no longer possible to plot in the graphics window: nothing appears.
xdel(winsid());
x=linspace(-%pi,%pi,1000)';
-ierr = execstr('surf(x,x,sin(x)*cos(x)'');','errcatch');
+ierr = execstr("surf(x,x,sin(x)*cos(x)'');","errcatch");
if ierr <> 0 then bugmes();quit;end
x=linspace(-%pi,%pi,100)';
plot(x,x);