use 5.010;

my %parsed;
while ( <DATA> ){
   my @tmp = split;
   $parsed{$tmp[0]}{x1}++ if $tmp[1] eq '1_x';
   $parsed{$tmp[0]}{c3}++ if @tmp > 2;
}

for my $k ( sort keys %parsed ) {
  say join ' ', $k, $parsed{$k}->{x1}, $parsed{$k}->{c3};
}

__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]

Update: The output part of the above code breaks for a given ID if (a) '1_x' never appears in column 2, or (b) '1_x' appears in column 2 but there is never a third column for this ID. To understand what I mean, add the following lines to __DATA__:

D v_x s_x
E 1_x

[download]

Solution: change the line in the for loop to:

  say join ' ', $k, $parsed{$k}->{x1} || 0, $parsed{$k}->{c3} || 0;

In reply to Re: List manipulation by Not_a_Number
in thread List manipulation by Anonymous Monk

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