How to make a shader with a mirror part and the other matte?

[MrCedric11111 (Cedric)]

I’m stuck, I can do full matte or full mirror but not 2 different parts

[Magnavis]

Duplicate your gradient, make it black and white, and then plug it into the roughness of the principled shader.

[AlphaChannel (Dr Salty Lout)]

like this…

[AlphaChannel (Dr Salty Lout)]

Or more control.

[MrCedric11111 (Cedric)]

Thank you guys, perfect