[amibroker] Best way to access Buy/Sell signals in conditional "if" statements

["trader07" <trader07@xxxxxxxxx>]

I am using the following for conditional IF.  I get error messages
that I cannot use arrays in conditional IF statements but then it goes
on to say index array [].  I am confused.  What is the best way to
access Buy/Sell signals (both current and past) in conditional "if"
statements?
Here is my code and error.

if(LastValue(Buy) == 1 && ref(Buy,-1) == 0 && Sell[1] != 1){
...
}

and I've tried this...

if(LastValue(Buy) == 1 && ref(Buy,-1) == 0 && ref(Sell,-1) != 1){
...
}

Here is the error.....
if(LastValue(Buy) == 1 && ref(Buy,-1) == 0 && Sell[1] != 1){
---------------------------------------------------^

Error 6
Condition in IF, WHILE, FOR statements
has to be Numeric or Boolean type.
You can not use array here,
please use [] (array subscript operator)
to access array elements




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