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How to plot a special plane x-y=5 with surf function

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Wei Wei
Wei Wei 2022-7-20
回答： Sam Chak 2022-7-20
Hi there! I am trying to plot special planes such as "x-y=5" and "z=2x" in which one dimension is missing using surf function. I am really confused here. Does anyone have a clue? Many thanks!

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回答（2 个）

Chunru
Chunru 2022-7-20
Ran in:
x = (-10:10)';
y = x - 5;
z = [-10 10]';
nz = length(z);
xx = x*ones(1, nz);
yy = y*ones(1, nz);
zz = ones(length(x), 1) * z';
surf(xx, yy, zz)
Sam Chak
Sam Chak 2022-7-20
Ran in:
HI @Wei Wei, not exactly sure about the "special" thing. Do you expect something like this?
[X, Y] = meshgrid(-1:2/40:1, -5:5/40:0);
Z1 = X - Y - 5;
surf(X, Y, Z1), hold on
Z2 = 2*X;
surf(X, Y, Z2)
xlabel('x'), ylabel('y'), zlabel('z')

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