[amibroker] How can you test to see if an array crossed a scalar value?

[potatosoupz]

I have an array that I'm testing at each iteration in a backtest. I'd like to 
test the latest (newest) value in the array to see if it has crossed below or 
above a scalar number (say the number 50.0). Is there a good way of doing this 
built in? It seems the Cross() function tests an array against an array. I 
could build an array that has all values of 50.0, but that seems wasteful.