[amibroker] Finding max and min

[mpdx58]

I'm using the rotational backtesting model and wondered if there's a way to 
find the max and min of the portfolio scores? Using the functions max and min 
didn't work the way I expected, they both return the same value when I do a 
trace. I'd try a for loop next, and just explicitly do the max/min tests, but 
that requires knowing the size of the array, doesn't it? 

PositionScore=LinRegSlope(C,Len);
MinScore=Min(PositionScore, 1000); // Min requires 2 arguments?
MaxScore=Max(PositionScore, -1000);
_TRACE("Min=" + MinScore + "Max=" + MaxScore);