Replace one value in a 2 variable's function

Hello. When we have a function of 2 variables is it possible to replace only one of them with a value (so after that it is a function of 1 variable). I want to do this without symbolic functions . for example input @(x,a)(..)=f then with 'for' loop the a changes every time so I want to write sth like feval(f,a-only) and f=@(x) and solve the equation with f(x) (newtons method but its not that matters)

I cant understand how I can say that i replace only a.

Answer 1

[Torsten]

g=@(x)f(x,a)

Then work with g.

Best wishes

Torsten.

[Eirini Gk]

Thank you. But there is no need of feval(f,a)? or sth like that? to define that its the same but replaces the a?

[Torsten]

No.

Best wishes

Torsten.

[Eirini Gk]

thank you very much!