Why is fimplicit not plotting x^2 = 0 ??

I have a code that takes in an implicit function from the user and then plots it. However, I ran into this odd problem where fimplicit is not plotting anything when the function is x^2. The code I entered :

fimplicit(@(x,y) x.^2,[-5 5 -5 5],'b-');

The output is just a plain white plot. No blue line at x=0. However, if I simply change my function to x.^2 - 1, everything works as expected. I'm guessing there is some trouble caused by the fact that x^2 is "tangential" to zero. (I know that this may be incorrect terminology.)

Is there any workaround for this?

EDIT: I am looking for a fix not only for the case of x.^2. The recommended solution must also be able to plot implicit functions as that is the primary requirement.

Thanks,

Mohit.

Answer 1

[madhan ravi]

fplot()

[Mohit Kumar]

The function entered by the user will, in general, be a function of x and y. As far as I understand, fplot works only for a single variable.

That is, the code below does not work.

fplot(@(x,y) x.^2)

Answer 2

[KSSV]

x = linspace(-5,+5,100) ; 
y = x.^2 ; 
plot(x,y)

[Mohit Kumar]

Perhaps I should have made this clearer in the question itself. The function entered by the user will, in general, be implicit. Say something like x^2*y^2+x^3*y^4+x+tan(x*y)+5=0.

That is why I cannot use plot.