Two suggestions. First:
selector1 = @() list(ceil(rand*size(list,1)), :);
Then each time you call
x = selector1()
you will get a random row of list. Note that the list is fixed once selector1 has been constructed: selector1 will always give you rows from the original list, even if you assign a new matrix to the variable "list".
So the second suggestions is:
selector2 = @(list) list(ceil(rand*size(list,1)), :);
which accepts an argument. You get random rows with
x = selector2(list);
This means that you can now get a random row of any matrix, not just the one hard-wired into the selector, and the current value of "list" will be used.
Which one of these you need depends on how you're going to use the function handle.
