How to modify a function handle?

Sorry I am not sure how to phrase the question but say I had a function handle say: myfun1 = @(y) y

Would I be able to modify that function and say something like myfun2 = @(y) myfun1*2

So when I write myfun2(5) it will return 10.

I essentially want to perform arithmetic on expressions representing functions of x to obtain other functions of x.

Answer 1

[per isakson]

That's simpler than you thought

%% 
f1 = @(y) y;
f2 = @(y) f1(y)*2;
%%
f2(5)

ans = 10