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Postings from January 2002
# Why not ...
while( <INFILE> )
{
@tmp = split( /\|/ );
if (exists $freq{$tmp[$table]})
{
$freq{$tmp[$table]}++
}
else
{
$freq{$tmp[$table]}=1
}
$tot ++
}
----- Original Message -----
From: "Balint, Jess" <JBalint@alldata.net>
To: <beginners@perl.org>
Sent: Thursday, January 31, 2002 6:45 PM
Subject: More Economic Use of Hash
> I am attemping to create a frequency chart based on a pipe delimited
> database output. Following is what I have come up with. The hash create
from
> this is then output to another file. It seems to be very slow on files in
> excess of ~10000 lines. This will be used on ~500000 line files and needs
to
> be a proficient as possible. If anyone knows a better way to do this, it
> would be extremely helpful. Thank you. -Jess
>
> $table is the number of the field which the frequency will be calculated
on.
> ex. a|b|c|d| if $table = 3 then c will be used
> @tmp is the split array of the line input
> %freqidx is the hash with fields values as keys and frequency counts
> $tot is for percentage calculation after this loop. this is basically an
> INFILE line count
>
> while( <INFILE> ) {
> @tmp = split( /\|/ );
> $x = 0;
> foreach( keys( %freqidx ) ) {
> if( $tmp[$table] ne $_ ) {
> $x = 1;
> } else {
> $x = 0;
> last;
> }
> }
> if( $x == 1 ) {
> $freqidx{$tmp[$table]} = 0;
> }
> $freqidx{$tmp[$table]}++;
> $tot++;
> }
>
> --
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