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Re: (elbie): Last two rows or a csv file.

by qball (Beadle)
on Aug 18, 2001 at 01:48 UTC ( [id://105808]=note: print w/replies, xml ) Need Help??


in reply to (elbie): Last two rows or a csv file.
in thread Last two rows or a csv file.

This is what I've got: 
#!/usr/bin/perl


open (FILE, "edidocs.csv") or die "Can't open file $!\n";

@lines = <FILE>;

while ($line = pop @lines) {
    print $line "\n";
}

[download]
It prints the rows from last to first. Now I need to get the first two rows timestamp and do the calulations. Then we'll be good to go!

qball~"I have node idea?!"

Replies are listed 'Best First'.
(elbie 2): Last two rows or a csv file.
by elbie (Curate) on Aug 18, 2001 at 02:09 UTC
    If you don't need to store the contents of the file, try this: 

    open (FILE, "edidocs.csv") or die "Can't open file $!\n";

my( $curr_time, $prev_time );  # Sorry about the $ in the original
while( <FILE> ) {
    $prev_time = $curr_time;
    $curr_time = ( split /,/ )[1];
}

    [download]

    If you do need to store the whole file, then the last two lines are stored in $lines( $#lines - 1 ) and $lines( $#lines ) of your example before you popped them off the stack.

    elbieelbieelbie

[reply]
[d/l]
[select]
      Great! This works beautifully. Now I'm onto another stumbling block. How would I get the same percentage calculation for the entire month using the epoch timestamp in the csv file?

      qball~"I have node idea?!"
[reply]

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