Hi,
I'd be glad for a little more help on this.Suppose my file looks like this: 
test.txt

2004,21,21,1,16.00
2004,21,21,1,16.25
2004,22,22,1,18.00
2004,22,22,1,18.25

[download]
The data in column 0 is the 'year', and that in column 2 is the 'day', so data in column 2 can have values from 1 to 31.In this table the only values we have are '21' and '22'.

Actually, after populating the array of arrays with the data from the text file:

I need to send in succession, the data from column 4 (say), for the col 2='21' rows,then the col 2='22' rows,.....and so on to a subroutine which will process the data in some way, and return a value to the main program.

For example, for the col 2='21' rows the values ,16.00,16.25 will be send to a sub 'Process'.'Process' finds the biggest(maximum) number amongst the set, and returns that value to the main program(16.25).Next the values 18.00 and 18.25 will be sent to 'Process'(for the col 2='22' rows)and again a value will be returned to the main program.

The day of the month may be from 1-31 , so we may need to send 31 sets of data to the sub 'Process'.

Column 2 is sorted, first we have all the '21' rows, then the '22' rows, then the '23' rows and so on.

All this sounds scary.I've tried doing things, with no luck. Any code or advice would be appreciated.
Thanks ,
perl_seeker:)

In reply to Re^2: Splitting text into arrays by perl_seeker
in thread Splitting text into arrays by perl_seeker

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