[amibroker] How to count from arrays?

[John Nelson <trader@xxxxxxxxxxxxxxx>]

All,

I'm counting the number of 1's and 0's from arrays which are the results 
of our well-known set of indicators. The 1's and 0's actually represent 
peaks and valleys and I'd like an indication of how many of them there 
are within a specific period starting from the current bar and going back 
myPeriod bars. I've noticed something strange though.

If I try to count in this manner....

for ( i = 0; i < myPeriod; i++ ) {
	if ( myarray[i] == 1 ) 
		total1 = total1 + 1;
	else
		total2 = total2 + 1;
	}

I stumble across a runtime error that admonishes me for having a subscript 
that is not between 0 ... (BarCount-1). However the following snippet of 
code avoids the runtime error...
                                                                                                 
for ( i = 0; i < BarCount && i < myPeriod; i++ ) {                                                                                            
        if ( myarray[i] == 1 )                                                                                                
                total1 = total1 + 1;                                                                                          
        else                                                                                                                  
                total2 = total2 + 1;                                                                                          
        }

Now this is really strange since I know "myPeriod" is far less than the
BarCount. Could it be that AFL operations aren't striclty linear in that
the results of my array operations preceeding the for loop are not yet
complete? Could it be that I don't understand how array subscripts work?

So what is the proper way to count the number of 1's and 0's in an array 
starting from the most recent bar and working back?

-- John




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