MATLAB: Can I change an individual matrix element by a given value in one line

Question

I want to increase one particular element in an array by a specified amount. Effectively, the code I want is:

a = [1, 2, 3];
a(1) += 2;

In my head, this gives an output of

a =
    [3, 2, 3]

However doing this gives an error, saying the array element is "not a valid target for an assignment".

Is there a way of doing this in one line, or do I have to do something like:

b = a(1) + 2;
a(1) = b;

Answer 1

a(1) = a(1) + 2;