need help in solving this problem

I have a plot of z from the following equation, in this the origin is 0 for x&y. now i have to plot a new graph where the origin of is same (0) but origin of y has shifted to 2 so y value is between 2-4

x = 0:0.01:4;
y = 0:0.01:4;
z = 16.6698.*(x.*y) - 23.0641.*(x.*y);
plot(x,z)

Answer 1

[Walter Roberson]

x = 0:0.01:4;
y = 0:0.01:4;
y2 = 2+y;
z = @(x,y) 16.6698.*(x.*y) - 23.0641.*(x.*y);
plot(x, z(x, y), x, z(x, y2))

Note that this code depends upon x and y being the same shape and orientation. It is not calculating for each combination of x and y, not building a surface.