rearrange data from one column to a row - perl

Question

I have the below data and I need to make the second column as the header. Any help is appreciated.
Data:
IBM,Voltality,7,73894756.93897434897
IBM,Market,100,983874.34324
GOOG,Sanity,15,8932748
GOOG,Rate Jump,25,873476378.234234
MBLY,Market,340,23423423432.6783
Output:
PRODUCT|Market|Rate Jump|Sanity|Voltality
IBM|100,983874.34324|||7,73894756.93897434897
GOOG||25,873476378.234234|15,8932748|||
MBLY|340,23423423432.6783|||
Code (incomplete / not sure hot to get to the end):
#!/usr/bin/perl
use strict;
use Getopt::Long;
use warnings;
use Data::Dumper;
my $valsep = ',';
my ( %type, %keys, %ccy, %cnt, %avg );
while (<>) {
chomp;
my ( $product, $reason, $count, $lat ) = split /,/;
my $key = "$product,$reason";
if ( not exists( $type{$reason} ) ) {
$type{$reason} = $reason;
}
$ccy{$key} = $product;
$cnt{$key} = $count;
$avg{$key} = $lat;
}
close(INPUT);
print Dumper ( \%ccy );
print Dumper ( \%type );
my ( %pair, %details );
foreach my $rows ( sort keys %ccy ) {
print "the key is : $rows and $ccy{$rows}\n";
foreach my $res ( sort keys %type ) {
print "The type is : $res and $type{$res}\n";
}
}

Answer 1

You just need to keep track of your columns and row data when parsing the data structure.
The following demonstrates:
#!/usr/bin/perl
use strict;
use warnings;
my $fh = \*DATA;
my %columns;
my %rows;
while (<$fh>) {
chomp;
my ( $company, $col, $vals ) = split ',', $_, 3;
# Track Columns for later labeling
$columns{$col}++;
$rows{$company}{$col} = $vals;
}
my #columns = sort keys %columns;
# Header
print join( '|', 'PRODUCT', #columns ), "\n";
for my $company ( sort keys %rows ) {
print join( '|', $company, map { $_ // '' } #{ $rows{$company} }{#columns} ), "\n";
}
__DATA__
IBM,Voltality,7,73894756.93897434897
IBM,Market,100,983874.34324
GOOG,Sanity,15,8932748
GOOG,Rate Jump,25,873476378.234234
MBLY,Market,340,23423423432.6783
Outputs:
PRODUCT|Market|Rate Jump|Sanity|Voltality
GOOG||25,873476378.234234|15,8932748|
IBM|100,983874.34324|||7,73894756.93897434897
MBLY|340,23423423432.6783|||

Answer 2

The following code will do the job; rather than using several hashes, I've put all the data in a hash of hashes. I've put comments in the script to explain what is happening in case you are not sure. You can, of course, delete them in your script.
#!/usr/bin/perl
use warnings;
use strict;
my %market;
while (<DATA>) {
next unless /\w/;
# remove line endings
chomp;
# split line by commas -- only split into three parts
my #col = split ",", $_, 3;
# save the data as $market{col0}{col1} = col2
$market{$col[0]}{$col[1]} = $col[2];
}
# create an output file
my $outfile = 'output.txt';
open( my $fh, ">", $outfile ) or die "Could not open $outfile: $!";
my #headers = ('Market','Rate Jump','Sanity','Volatility');
# print out the header line, joined by |
print { $fh } join('|', 'PRODUCT', #headers) . "\n";
# for each product in the market data
for my $p (sort keys %market) {
# print the product name
print { $fh } join('|', $p,
# go through the headers using map (map acts like a "for" loop)
# if the relevant property exists in the market data, print it;
# if not, print nothing
map { $market{$p}{$_} // '' } #headers) . "\n";
}
# this is the input data. You might be reading yours in from a file
__DATA__
IBM,Voltality,7,73894756.93897434897
IBM,Market,100,983874.34324
GOOG,Sanity,15,8932748
GOOG,Rate Jump,25,873476378.234234
MBLY,Market,340,23423423432.6783
Output:
PRODUCT|Market|Rate Jump|Sanity|Volatility
GOOG||25,873476378.234234|15,8932748|
IBM|100,983874.34324|||7,73894756.93897434897
MBLY|340,23423423432.6783|||