How to plot 3d plane of type where one variable is missing like x + y = 0.....

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Mesbahose Salekeen
Mesbahose Salekeen 2021-6-18
评论： Mesbahose Salekeen 2021-6-18
x = -2:.05:2;
y = -2:.05:2;
[X,Y] = meshgrid(x,y);
now how do i define Z to relate with X,Y to create plane so i can do surf(X,Y,Z) ?

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Matt J
Matt J 2021-6-18
编辑：Matt J 2021-6-18
If you mean that you have a plane equation of the form a*x+b*y+0*z=d, then you can use
https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-for-fitting-conics-and-quadrics
obj=planarFit.groundtruth([],[a,b,0],d);
obj.showfit
xlabel X, ylabel Y, zlabel Z
  1 个评论
Mesbahose Salekeen
Mesbahose Salekeen 2021-6-18
i figured an easy way now
t = linspace(-1,1,50);
x = t;
z = linspace(-5,5,50);
[X,Z] = meshgrid(x,z);
Y = X;
surf(X,Y,Z)
this will create planer surface of x - y = 0

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