plane y=x

Hei , I want to drow this planes y=x,z=x,z=y in 3D using fsurf but dont know fow to set the function?

Answer 1

[KSSV]

% plane z=x,
figure
hold on
fsurf(@(x,y) x)

% plane z = y

fsurf(@(x,y) y)

view(3)