MATLAB: How do i plot a 3d function and a 2d curve together

2dplot3dplotcurveMATLAB Online Serverpiecewise functionsplot

Hi, i'm new to matlab and i need to plot both: (i don't really know if this is possible but it is worth trying)
1) this 3d function:
f(x,y)= (x^2)/(x^2 – y^2) when |x| ≠ |y|
0 when |x| = |y|
and
2) the curve y=mx where m could be all numbers in ℝ or just some of those numbers.
Both graphs should be seen together.
thx!

Best Answer

m = 100 ; n = 100 ; 
x = linspace(-1,1,m) ;   % define your range of x
y = linspace(-1,1,n) ;   % define your range of y 
[X,Y] = meshgrid(x,y) ; 
Z = X.^2/(X.^2-Y.^2) ; 
Z(X==Y) = 0 ; 
m = rand ; 
y = m*x ; 
surf(X,Y,Z)
hold on
plot3(x,y,zeros(size(x))) ;
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