fimplicit3 error: Array sizes must match

Hello everybody!

I have a problem with the function fimplicit3.

I try to plot simple surfaces as x^2 + y^2 - z^2 using two lines of code:

syms x y z
fimplicit3(x^2 + y^2 - z^2)

and no matter wich surface I want to plot it returns me the same error everytime! Even if i try the script in thet MATLAB help section inside the program.

This is the message that i get everytime I try: "Warning: Error updating ImplicitFunctionSurface

Array size must match."

What can I do ? Thanks for your help!

[Darshan Ramakant Bhat]

I tried your code in my machine, it is working fine. Also as a suggestion try to use

fimplicit3(x.^2 + y.^2 - z.^2)

instead of ^2.

Try to run it using a function handle like below

f = @(x,y,z) x.^2 + y.^2 - z.^2;
fimplicit3(f)

[Loris Chavée]

That still doesn't work! I don't understand...This function worked properly 2 weeks ago and now everything fails!

[Walter Roberson]

That sort of sudden change can happen sometimes if you accidentally create function with the same name as an internal Mathworks function.

Try using

restoredefaultpath

and then executing your code; if it works then something on your path was the problem.

[Loris Chavée]

Still the same result.

[Walter Roberson]

Which MATLAB version are you using?

[Loris Chavée]

The last one, R2016b

[Loris Chavée]

Ok I don't know why but now it works! Thanks for your help! I deleted all the functions i created and now it's back to normal!

[Karan Gill]

My guess is that you had already defined x,y, or z so clearing all your variables solved the problem.