How do I make a univariate function handle out of a multivariate function?

I want to use the eigs function with function handle input:

d = eigs(Afun,n,___)

Here Afun is a function handle, which -for generic vector x- returns A*x, i.e. Afun(x) = A*x.

I have a function, let's say Aasfunction(x,lambda), which indeed returns A*x, and A depends on a parameter lambda: A=A(lambda).

How can I create a univariate function handle from Aasfunction(x,lambda), with one input, and fix lambda in the definition?

(I guess I can alway define a function Awithfixedlambda(x)=Aasfunction(x,lambda), and lambda is fixed to some numerical value inside the function definition, but I'm looking for a solution, where I can avoid this.)

Thank you!

Answer 1

[Gyorgy Feher]

Ok, it seems the following works:

lambda=...; %define lambda at whaatever value you want
Afun=@(x) Aasfunction(x,lambda);
eigs(Afun,...) %there is a necessary second parameter, the dimension of A, which needs to be specified

Also, check out this thread:

https://www.mathworks.com/matlabcentral/answers/341148-how-to-pass-a-function-handle-if-some-input-argument-is-fixed