MATLAB: Troubles plotting y==0 using fimplicit

Question

I have troubles to use fimplicit function to plot two simple functions defined implicitly:

syms x y
fimplicit([x==0,y==0])

Apparently, the solution set for the second equation (y==0) is not plotted correctly. If x is understood by the function as the horizontal axis, which is suggested by seeing a vertical graph for the x==0 equation, the graph for the y==0 equation should be a horizontal line and it is not:

fimplicit(y==0)

Strangely enough, if the function definining the equation is only slightly perturbed, the problem dissapears

fimplicit(y+10e-8*x==0)
axis([-5 5 -5 5])

Answer 1

Hi, you could try the below code

fimplicit(@(x,y) x);hold on;fimplicit(@(x,y) y)