[amibroker] how to find first bar's close in intraday data

["parthshanishwara" <parthshanishwara@xxxxxxxxx>]

hello everybody
i am new here and learning to write formula i want assistance for 
writing code for exploration which give columns
(data is of one minut duration) (i can write formula if duration is 
one day but finding difficult to write code for intraday 1 minut data)
EXPLORATION 1
column 1
time of first bar (of last date)for differnt symbols(there is slight 
variation in time of first bar for different symbols)
  
EXPLORATION 2
column 1
close of first bar(of different dates)for single symbol
column 2
close of last bar(of different dates)for single symbol

EXPLORATION 3
column 1
simple average of((high-low)/volume)of single date for single symbol 
view need to be like 

TICKER DATE       TIME   COLUMN1
AMD    20070625 9:31:59 here ma of((high-low)/volume)of date 20070625
AMD    20070625 9:32:59 same as above
AMD    20070625 9:33:59 same as above
AMD    20070625 9:34:59 same as above

thanks in advance
p s 





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