The code below is what I got so far, but I'm still getting the "|0.0"
for the first row returned. I don't know which part of the code is
generating this, could someone help explain this to me? Thanks for all
your help.
new_ratings.txt:
base_no|AvgRating
|0.0
10000|4.7
10007|4.5
10008|2.5
#!/usr/bin/perl
#######################################################################
# This script reads through reviewsRating.txt and calculates an average
#
# rating for each base_no
#
#######################################################################
use strict;
use warnings;
my %numsum;
my %numcnt;
my $output= 'new_ratings.txt';
my $file ='reviewsRating.txt';
#Open output file to print header row
open(OUT,">$output") or die "Could not open $output: $!";
print OUT "base_no|AvgRating\n";
close(OUT);
open my $fh, '<', $file or die $!;
open OUT, '>>', $output or die "Could not open '$output' $!";
while(<$fh>){
next if $. == 1; # exclude header
chomp;
my ($num, $rate) = split/\|/;
$numsum{$num} += $rate;
++$numcnt{$num};
}
for (sort keys %numsum){
my $numavg = sprintf "%.1f",$numsum{$_} / $numcnt{$_};
print OUT "$_\|$numavg\n";
}
close($fh);
close(OUT);
________________________________
From: michael wang [mailto:[EMAIL PROTECTED]
Sent: Friday, December 07, 2007 2:29 PM
To: Mike Tran
Cc: beginners@perl.org
Subject: Re: Calcualting Avg.
Hi
On 12/7/07, Mike Tran <[EMAIL PROTECTED]> wrote:
Hi All,
I'm not very familiar with Perl yet, so could someone help me with this
please? I have a file which has two columns one called Basenumber the
other Rating (Rating.txt), how do I loop through and get an average for
the Rating column for each distinct baseNumber? I want to write the new
result out into a new file called AvgRatings.txt. Thanks in advance for
any help on this.
Rating.txt:
Basenumber|Rating
10000|5
10000|4
10000|5
10007|4
10007|5
10007|4
10007|5
10008|4
10008|3
10008|2
10008|1
The new file (AvgRatings.txt) should looks like this:
Basenumber|AvgRating
10000|4.67
10007|4.5
10008|2.5
Best regards,
Mike Tran
e: [EMAIL PROTECTED]
t: (307) 772-8956
Learn perl hash something like:
use strict;
use warnings;
my %numsum;
my %numcnt;
while(<DATA>){
chomp;
my ($num, $rate) = split/\|/;
$numsum{$num} += $rate;
++$numcnt{$num};
}
print "Basenumber|AvgRating\n";
for (sort keys %numsum){
my $numavg = $numsum{$_} / $numcnt{$_};
print "$_\|$numavg\n";
}
__DATA__
put your data here
