Re: List manipulation

See the comments for explanation:

#!/usr/bin/perl
use strict;
use warnings;
use feature 'say';

my $last = '';                                    # Remember the id.
my $count_1_x;
my $count_nonblank;
while (<DATA>) {
    my ($id, $col2, $col3) = split;
    if ($id ne $last) {                           # A new record begin
+s.
        say "$last $count_1_x $count_nonblank"
            if $last;                             # Do not print at th
+e very beginning.
        $last = $id;
        $count_1_x = $count_nonblank = 0;
    }
    $count_1_x++      if '1_x' eq $col2;
    $count_nonblank++ if defined $col3 and length $col3;
}
say "$last $count_1_x $count_nonblank" if $last;  # Print for the last
+ record.

__DATA__
A 1_x 9_z
A 1_x 
A 1_x g_z
B 2_c 
B 1_x 1_z
C 1_x 1_z
C v_x 8_z 
D v_x s_x
E 1_x 
F
[download]

Update: Updated to comfort warnings on emtpy column 3.

Comment on Re: List manipulation Download Code

Replies are listed 'Best First'.
Re^2: List manipulation by tobyink (Canon) on May 31, 2012 at 17:59 UTC
This was more an experiment in whether it would be possible, than a piece of sound advice... `use 5.010; use List::MoreUtils qw< part >; say for map { my $x = $_; sprintf( '%s %d,%d', $x->[0][0], scalar(grep { $_->[1] eq '1_x' } @$x), scalar(grep { defined $_->[2] } @$x), ) } part { # me thinks List::MoreUtils needs a way to make this simpler state $part = 0; state $last = undef; $part++ if defined $last && $last ne $_->[0]; $last = $_->[0]; $part } map { chomp; [split /\s+/] } sort <DATA>; __DATA__ A 1_x 9_z A 1_x A 1_x g_z B 2_c B 1_x 1_z C 1_x 1_z C v_x 8_z` [download] `perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'`	[reply] [d/l]

Replies are listed 'Best First'.

Re^2: List manipulation
by tobyink (Canon) on May 31, 2012 at 17:59 UTC

This was more an experiment in whether it would be possible, than a piece of sound advice...

use 5.010;
use List::MoreUtils qw< part >;

say for
    map {
        my $x = $_;
        sprintf(
            '%s %d,%d',
            $x->[0][0],
            scalar(grep { $_->[1] eq '1_x' } @$x),
            scalar(grep { defined $_->[2] } @$x), 
        )
    }
    part {
        # me thinks List::MoreUtils needs a way to make this simpler
        state $part = 0;
        state $last = undef;
        $part++ if defined $last && $last ne $_->[0];
        $last = $_->[0];
        $part
    }
    map { chomp; [split /\s+/] }
    sort <DATA>;

__DATA__
A 1_x 9_z
A 1_x 
A 1_x g_z
B 2_c 
B 1_x 1_z
C 1_x 1_z
C v_x 8_z
[download]

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

[reply]
[d/l]