Confusion on Meshgrid and interp2

Question

Michael Lynch 2020-6-2

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评论： darova 2020-6-14

So i have x and y coordinates and i need to create sample points for the x and y coordinates to be evaluated at. I must use interp2 on these points in order to graph them.

I thought it would look something like this.

x = -0.5:0.1:0.5;
y = -0.5:0.1:0.5; 
k = 0.77;
[x,y] = meshgrid(x,y);
z = k*(x.^2-y.^2);
m = [-0.5 0 0.5];
n = [-0.5 -0.25 0.25 0.5];
[m,n] = meshgrid(m,n);
f = interp2(x,y,z,m,n);
surf(x,y,f)

I am confused on where to go from here any help would be greatly appreciated.

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darova 2020-6-14

在 MATLAB Online 中打开

You code is correct. Just add these lines

scatter3(m(:),n(:),f(:))
surface(x,y,z)

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Answer 1

David Hill 2020-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/540908-confusion-on-meshgrid-and-interp2#answer_445244

在 MATLAB Online 中打开

x = -0.5:0.1:0.5;
y = -0.5:0.1:0.5; 
k = 0.77;
[x,y] = meshgrid(x,y);
z = k*(x.^2-y.^2);
m = [-0.5 0 0.5];
n = [-0.5 -0.25 0.25 0.5];
[m,n] = meshgrid(m,n);
f = interp2(x,y,z,m,n);%you are interpolating m and n to the x and y values; therefore f is the size of [m,n]
surf(m,n,f);%have to plot f against m and n (same size)

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Michael Lynch 2020-6-2

I don't think this quite what i was looking for. Do you know how I can plot the surf with the meshgrid of x and y? I only want m and n to be the query points I think

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