xdel(winsid());
x=linspace(-%pi,%pi,1000)';
-ierr = execstr('surf(x,x,sin(x)*cos(x)'');','errcatch');
-if ierr <> 17 then pause,end
+ierr = execstr("surf(x,x,sin(x)*cos(x)'');","errcatch");
+if ierr <> 0 then pause,end
x=linspace(-%pi,%pi,100)';
plot(x,x);
curfig = gcf();