[amibroker] Exploration afl help

[ssingh_01803]

Hi, I'm running exploration for symbol YGE with the following code:

HClose = HighestSince((C == C[0] ), C);
Filter = 1;
AddColumn(Close, "Close");
AddColumn(HClose, "HClose");


But I'm not getting proper values in HClose array. I think it works 
just fine if I change C[0] to any other value such as C[1] or any other 
array index but it doesn't work for C[0]. What is wrong and how can I 
correct this.

Thanks,
Sita