How can I make a symbolic function with vector input?

I want to make a symbolic function with vector input.

I tried a code

a=sym('a',[1 3]);

f(a)=a(1)^2+a(2)+a(3)*a(1);

k=[1 1 1];

f(k)

But it didn't work. I could find that f(1,1,1) works, but I want to make f with f([1 1 1]). How could I do it?

Answer 1

[Jyotsna Talluri]

a=sym('a',[1 3]);
f= @(a)(a(1)^2+a(2)+a(3)*a(1));
k=[1 1 1];
f(k)