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.)