I am writing a little script that reads in a CSV file and stuffs each line into an array, as below: 
[...]

# Read in the file
while (my $line = <FILE> ) 
{
    if ($csv->parse($line))
    {
        @row = $csv->fields();
        push @data, [ @row ];
    }
}

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one row in @data looks about like this: (I produced the below line with this code:) 
for ($i=0 ; $i < $lines; $i++)
{
    for (my $j=0; $j < 6; $j++)
    {
      print "$data[$i][$j] ";
    }
    print "\n";
}

QP 2/27/2008 555 1000.00   2493819320

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Anyway, what I need to do is: 
1) Generate the sum of element 3 where element 1 reoccurs in the array
+. I.e., tally the day's sales.
2. Print out a line with the sum of the day's sales.
3. Print the row with each individual sale, with element 3 made negati
+ve.

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When I was merely producing one entry per row in the array, I used the code below, which worked just fine, but summing the sales by date is throwing me. 

for ($i=0 ; $i < $lines; $i++)
{
    $amount = $data[$i][3] * -1;
    
    print OUTFILE "some header information\n";
    print OUTFILE "some more header info\n";
        print OUTFILE "$data[$i][1]\t1350 Account\t$data[$i][3]\t$data
+[$i][0]\t$data[$i][4]\n";
    print OUTFILE "$trnsid\tt$data[$i][1]\t2600Other:$data[$i][2]\t$am
+ount\t$data[$i][0] $data[$i][4]\n";
                
}

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In reply to Silly array-ish question. by fleurdmiller

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