Create indexing array with 'end' before vector exists

Question

I was just wondering if there is a way to index using end before knowing a vector's size? It should work for arrays with different sizes. Like this:

subvector = (2:end) % illegal use of end

A=[1 2 3];
B=[4 5 6 7];

A(subvector) % should be 2 3
B(subvector) % should be 5 6 7

Answer 1

You can set up an anonymous function to act in a similar way

f_end = @(v) v(2:end);

A = [1 2 3];
B = [4 5 6 7];

f_end( A ); % = [2 3];
f_end( B ); % = [5 6 7];

I think this is the only way you could do it, since you can't set up an indexing array without knowing the end index.

Answer 2

Without indexing or usage of end, one can remove the first element:

f_end = A;
f_end[1] = [];

As a function:

function x = f_end(y, n)
    x = y;
    x[1:n]=[]; % deletes the first n elements