How can I plot a figure with multiplying a vector with matrices?

How can I plot the below figure in matlab?

I tried the below source code:

[X,Y] = meshgrid(-6:0.1:6);                                
Z = [X Y].*[2 1;1 3].*([X Y].') + [1 2].*[X Y].' + 3;
surf(X,Y,Z)
colormap(jet)
colorbar

and

[X,Y] = meshgrid(-6:0.1:6);                                
Z = [X Y]*[2 1;1 3]*([X Y].') + [1 2]*[X Y].' + 3;
surf(X,Y,Z)
colormap(jet)
colorbar

However, it showed the errors:

Error using  .* 
Matrix dimensions must agree.

Error in Fig20_3 (line 2)
Z = [X Y].*[2 1;1 3].*([X Y].') + [1 2].*[X Y].' + 3;

and

Error using  * 
Inner matrix dimensions must agree.

Error in Fig20_3 (line 2)
Z = [X Y]*[2 1;1 3]*([X Y].') + [1 2]*[X Y].' + 3;

Answer 1

[Walter Roberson]

This is a case where you need the * operator instead of the .* operator

[Walter Roberson]

you will also need some reshape operations. I will post a bit later.

[TRUNG HOANG]

I used both the * operator and the .* operator but it still showed errors. I think that the multiplication between matrix and vector is problem.

[Walter Roberson]

I think it might be easiest to expand the expression:

[X,Y] = meshgrid(-6:0.1:6);
Z = X + 2*Y + X .* (2*X + Y) + Y .* (X + 3*Y) + 3;

surf(X, Y, Z, 'edgecolor', 'none')

[madhan ravi]

TRUNG HAONG comments:

Good.

Answer 2

[madhan ravi]

 doc fsurf