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counting average values

Posted on 2009-07-11
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Last Modified: 2012-05-07
the code below sorts numbers into various groupings

the average value; is it possible the

1. get the highest average value
2. the lowest average value
3. the average, average value ?
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
use List::Util qw(sum);
 
##### Open files
open(my $IN,"invim2.vim") or die "Could not open input: $!\n";
open(my $OUT,">outvim2.vim") or die "Could not open output: $!\n";
 
##### Step 1: read a line, and split it on comma
while(<$IN>){
        chomp;
        my @arr = split /,/;
        next unless @arr;
 
        # discard 1st and last item
        shift @arr; pop @arr; pop @arr;
 
        ##### Step 2: Sort data into ascending order
        @arr = sort {$a <=> $b} @arr;
        print "arr @arr\n";
 
        ##### Step 3: Calculate difference between neighboring pairs
        my @diff = ($arr[0], map {$arr[$_] - $arr[$_-1]} (1..$#arr));
        print "diff @diff\n";
 
        ##### Step 4: Calculate amount in each group
        my @groups = (0)x5;
        foreach my $a (@arr) {
                $groups[$a/10]++;
        }
        print "group @groups\n";
        ##### Step 6: Calculate average
 
        my $avg1 = sum(@arr)/@arr;
        printf "arr avg %.2f\n", $avg1;
        my $avg2 = sum(@diff)/@diff;
        printf "diff avg %.2f\n", $avg2;
 
        ##### Step 5: Print results
        print $OUT join("\t", @arr) . "\tavg " . sprintf("%.2f\t", $avg1) . "group " . join("", @groups) . "\n";
        print $OUT join("\t", @diff) . "\tavg " . sprintf("%.2f\t", $avg2) . "\n";
        print $OUT "\n";
}
 
 
close($IN);
close($OUT);

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Question by:Europa MacDonald
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5 Comments
 
LVL 40

Expert Comment

by:mrjoltcola
ID: 24832793
Averages from which dataset, the input dataset or the diff dataset?
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LVL 40

Expert Comment

by:mrjoltcola
ID: 24832797
Also how to format the output?
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LVL 40

Accepted Solution

by:
mrjoltcola earned 2000 total points
ID: 24832833

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
use List::Util qw(sum);
 
##### Open files
open(my $IN,"invim2.vim") or die "Could not open input: $!\n";
open(my $OUT,">outvim2.vim") or die "Could not open output: $!\n";
 
my @avgs1;
my @avgs2;
my ($maxavg1, $minavg1, $maxavg2, $minavg2);
 
##### Step 1: read a line, and split it on comma
while(<$IN>){
        chomp;
        my @arr = split /,/;
        next unless @arr;
 
        # discard 1st and last item
        shift @arr; pop @arr;
 
        ##### Step 2: Sort data into ascending order
        @arr = sort {$a <=> $b} @arr;
        print "arr @arr\n";
 
        ##### Step 3: Calculate difference between neighboring pairs
        my @diff = ($arr[0], map {$arr[$_] - $arr[$_-1]} (1..$#arr));
        print "diff @diff\n";
 
        ##### Step 4: Calculate amount in each group
        my @groups = (0)x5;
        foreach my $a (@arr) {
                $groups[$a/10]++;
        }
        print "group @groups\n";
        ##### Step 6: Calculate average
 
        my $avg1 = sum(@arr)/@arr;
        printf "arr avg %.2f\n", $avg1;
        if(!$maxavg1 || $avg1 > $maxavg1) { $maxavg1 = $avg1; }
        if(!$minavg1 || $avg1 < $minavg1) { $minavg1 = $avg1; }
        push @avgs1, $avg1;
 
        my $avg2 = sum(@diff)/@diff;
        printf "diff avg %.2f\n", $avg2;
        if(!$maxavg2 || $avg2 > $maxavg2) { $maxavg2 = $avg2; }
        if(!$minavg2 || $avg2 < $minavg2) { $minavg2 = $avg2; }
        push @avgs2, $avg2;
 
        ##### Step 5: Print results
        print $OUT join("\t", @arr) . "\tavg " . sprintf("%.2f\t", $avg1) . "group " . join("", @groups) . "\n";
        print $OUT join("\t", @diff) . "\tavg " . sprintf("%.2f\t", $avg2) . "\n";
        print $OUT "\n";
}
 
printf "input: maxavg %d minavg %d avgavg %d\n", $maxavg1, $minavg1, sum(@avgs1)/@avgs1;
printf $OUT "maxavg %d minavg %d avgavg %d\n", $maxavg1, $minavg1, sum(@avgs1)/@avgs1;
printf "diff: maxavg %d minavg %d avgavg %d\n", $maxavg2, $minavg2, sum(@avgs2)/@avgs2;
printf $OUT "maxavg %d minavg %d avgavg %d\n", $maxavg2, $minavg2, sum(@avgs2)/@avgs2;
 
close($IN);
close($OUT);

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Author Comment

by:Europa MacDonald
ID: 24834287
sorry mrjoltcola, net crashed last night and I went to bed :-)

what I was sking for:
the code just now will calculate the average value and the average difference value.

I want to know, for both averages

the highest value average
the lowest value average
the average of the range of value averages (the mean average)

I will try that code above and let you know

thankyou

0
 

Author Closing Comment

by:Europa MacDonald
ID: 31602498
great
0

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