MATLAB: Surface Plot is Black

Question

Hi I have a simple code as bellow. why the surface plot is black?

 mi_x=3.75;
mi_y=113.75;
si_x=11.78511;
si_y=250.2842;
cor_coef=0.964811;
fxy1=(1/(2*pi*si_x*si_y*sqrt(1-cor_coef^2)));
exp1=-1/(2-2*cor_coef^2);
[x,y] = meshgrid(0:50,0:975);
exp2=(((x-mi_x)/si_x).^2-2.*cor_coef*(x-mi_x).*(y-mi_y)/si_x/si_y+((y-mi_y)/si_y).^2);
fxy=fxy1.*exp(exp1.*exp2);
surf(x,y,fxy);

Why Plot is black!! I tried codes in help, but it didn't work for me !

Thanks

Answer 1

Change to

surf(x, y, fxy, 'edgecolor', 'none');