How to swap elements in a vector using an anonymous function in Octave?

Question

Swapping two elements in a vector/matrix is very simple in Octave:

x='abcde';
x([4,1])=x([1,4])
x = 
   dbcae

Unfortunately, I have yet to find a way to do this inside an anonymous function. While the function below is syntactically correct, it only gives back the two elements that are swapped, not the entire x vector:

f=@(x)(x([4,1])=x([1,4]))
f(x)
ans = 
     ad

Is there a way to achieve the desired behavior using anonymous functions in a golfy way? Can several elements be swapped this way using an anonymous function?

I could create an indexing vector: f=@(x)x([4,2,3,1,5]), but creating such a vector dynamically will likely take a lot of bytes too.

Answer 1

Argument List

f=@(x,y=x([4 1])=x([1 4]))x;

Try it online!

Answer 2

Be eval

f=@(x)eval"x([4 1])=x([1 4])"

Try it online!

---

In Matlab the parentheses cannot be omitted:

f=@(x)eval('x([4 1])=x([1 4])')

Answer 3

Cell array

One option is to use a cell array, like this:

f=@(x){x([1,4])=x([4,1]);x}{2}

Try it online!