% Trace a Gauss curve in 3D
std = 1;
x=[-2:.05:2];
y=[-2:.05:2];
[X,Y]=meshgrid(x,y);
gauss=(1/(std*sqrt(2*pi)))*exp((-X.^2-Y.^2)/(2*std^2) );
surf(X,Y,gauss);

% Beautify image
colormap(gray);
ylabel('Y');
xlabel('X');
zlabel('Z');
title('Distribution normale tri-dimentionnelle');