arg_max for 2d arrays?

[artsiomkaltovich]

First of all, I apologize if this should be an issue for the libminizinc project or if it shouldn’t be an issue at all.

What does $$E mean in the following code?

function $$E: arg_max(array [$$E] of bool: x)
function $$E: arg_max(array [$$E] of int: x)
function $$E: arg_max(array [$$E] of float: x)

Is it possible to use arg_max for 2D arrays or arrays with higher dimensions? Could you provide a working example of how to use it?

Thank you in advance.