2-dimensional gauss function with Matlab (使用Matlab绘制二维高斯函数图象)

2-dimensional gauss function with Matlab (使用Matlab绘制二维高斯函数图象)

by using following codes.
%%
X1 = [0:0.1:10];

X2 = [0:0.1:10];

[X,Y] = meshgrid(X1,X2);

Z = exp(-((X-5).*(X-5)+(Y-5).*(Y-5))/18);

surf(X,Y,Z);
%%
the result is as following...

2D gauss function.

and the distribution of 4*(x*y)/pow((x+y),2) is

X1 = [0:1:100];

X2 = [0:1:100];

[X,Y] = meshgrid(X1,X2);

Z = 4*X.*Y./(X+Y)./(X+Y);

surf(X,Y,Z);

the relationship between eigenvalues of Harris Matrix

so we can see along the line y=x the value is maximized.