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

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) ?

Answer 1

[Matt J]

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

[Mesbahose Salekeen]

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