I have array of IDs. I have one ID which I want to find if that ID exists in the array of IDs in Perl
I tried the following code:
my $ids = [7,8,9];
my $id = 9;
foreach my $new_id (#$ids) {
if ($new_id == $id) {
print 'yes';
} else {
print 'no';
}
}
I get the output as:
nonoyes
Instead I want to get the output as only:
yes
Since ID exists in array of IDs
Can anyone please help ?
Thanks in advance
my $ids = [7,8,9];
my $id = 9;
if (grep $_ == $id, #ids) {
print $id. " is in the array of ids";
} else {
print $id. " is NOT in the array";
}
You just need to remove the else part and break the loop on finding the match:
my $flag = 0;
foreach my $new_id (#$ids) {
if ($new_id == $id) {
print 'yes';
$flag = 1;
last;
}
}
if ($flag == 0){
print "no";
}
Another option using hash:
my %hash = map { $_ => 1 } #$ids;
if (exists($hash{$id})){
print "yes";
}else{
print "no";
}
use List::Util qw(any); # core module
my $id = 9;
my $ids = [7,8,9];
my $found_it = any { $_ == $id } #$ids;
print "yes" if $found_it;
The following piece of code should cover your requirements
use strict;
use warnings;
my $ids = [7,8,9];
my $id = 9;
my $flag = 0;
map{ $flag = 1 if $_ == $id } #$ids;
print $flag ? 'yes' : 'no';
NOTE: perhaps my #ids = [7,8,9]; is better way to assign an array to variable
I need to extract by unique genus (first part of the name of species) in one column but with by biggest number in another column in a CSV file when having multiples of the same name.
So if have multiple genus (same first name) then take the biggest number in the last column to select which will represent that genus.
I have extracted the information into arrays, but I am having trouble with combining the two in order to select. I was using
https://perlmaven.com/unique-values-in-an-array-in-perl
to help but I need to include biggest number in last column when have the same genus situation.
use strict;
use warnings;
open taxa_fh, '<', "$ARGV[0]" or die qq{Failed to open "$ARGV[0]" for input: $!\n};
open match_fh, ">$ARGV[0]_genusLongestLEN.csv" or die qq{Failed to open for output: $!\n};my #unique;
my %seen;
my %hash;
while ( my $line = <taxa_fh> ) {
chomp( $line );
my #parts = split( /,/, $line );
my #name = split( / /, $parts[3]);
my #A = $name[0];
my #B = $parts[5];
#seen{#A} = ();
my #merged = (#A, grep{!exists $seen{$_}} #B);
my #merged = (#A, #B);
#hash{#A} = #B;
print "$line\n";
}
close taxa_fh;
close match_fh;
Input example:
AB179735.1.1711,AB179735.1.1711,278983,Eucyrtidium hexagonatum,0,1600
AB179736.1.1725,AB179736.1.1725,278986,Pterocorys zancleus,0,1763
AB181888.1.1758,AB181888.1.1758,281609,Protoperidinium crassipes,0,1700
AB181890.1.1709,AB181890.1.1709,281610,Protoperidinium denticulatum,0,1800
AB181892.1.1738,AB181892.1.1738,281611,Protoperidinium divergens,0,1800
AB181894.1.1744,AB181894.1.1744,281612,Protoperidinium leonis,0,1500
AB181899.1.1746,AB181899.1.1746,281613,Protoperidinium pallidum,0,1600
AB181902.1.1741,AB181902.1.1741,261845,Protoperidinium pellucidum,0,1750
AB181904.1.1734,AB181904.1.1734,281614,Protoperidinium punctulatum,0,1599
AB181907.1.1687,AB181907.1.1687,281615,Protoperidinium thorianum,0,1600
AB120001.1.1725,AB120001.1.1725,244960,Gyrodinium spirale,0,1500
AB120002.1.1725,AB120002.1.1725,244961,Gyrodinium fusiforme,0,1800
AB120003.1.1724,AB120003.1.1724,244962,Gyrodinium rubrum,0,1700
AB120004.1.1723,AB120004.1.1723,244963,Gyrodinium helveticum,0,1500
AB120309.1.1800,AB120309.1.1800,4442,Camellia sinensis,0,1700
Wanted output:
AB179735.1.1711,AB179735.1.1711,278983,Eucyrtidium hexagonatum,0,1600
AB179736.1.1725,AB179736.1.1725,278986,Pterocorys zancleus,0,1763
AB181890.1.1709,AB181890.1.1709,281610,Protoperidinium denticulatum,0,1800
AB120002.1.1725,AB120002.1.1725,244961,Gyrodinium fusiforme,0,1800
AB120309.1.1800,AB120309.1.1800,4442,Camellia sinensis,0,1700
use Text::CSV_XS qw( );
my $csv = Text::CSV_XS->new({
auto_diag => 2,
binary => 1,
quote_space => 0,
});
my %by_genus;
while ( my $row = $csv->getline(\*ARGV) ) {
my ($genus) = split(' ', $row->[3]);
$by_genus{$genus} = $row
if !$by_genus{$genus}
|| $row->[5] > $by_genus{$genus}[5];
}
$csv->say(select(), $_) for values(%by_genus);
Properly naming the variables makes the code more readable:
#! /usr/bin/perl
use warnings;
use strict;
my %selected;
while (<>) {
my ($species, $value) = (split /,/)[3, 5];
my $genus = (split ' ', $species)[0];
if ($value > ($selected{$genus}{max} || 0)) {
$selected{$genus}{max} = $value;
$selected{$genus}{line} = $_;
}
}
for my $genus (keys %selected) {
print $selected{$genus}{line};
}
The order of the output lines is random.
You can this Perl command line as well
perl -F, -lane ' ($g=$F[3])=~s/(^\S+).*/$1/; if( $mx{$g}<$F[-1])
{ $kv{$g}=$_;$mx{$g}=$F[-1] } END { print $kv{$_} for(keys %kv) } ' file
with the given inputs in cara.txt file, the output is
$ perl -F, -lane ' ($g=$F[3])=~s/(^\S+).*/$1/; if( $mx{$g}<$F[-1])
{ $kv{$g}=$_;$mx{$g}=$F[-1] } END { print $kv{$_} for(keys %kv) } ' cara.txt
AB179736.1.1725,AB179736.1.1725,278986,Pterocorys zancleus,0,1763
AB179735.1.1711,AB179735.1.1711,278983,Eucyrtidium hexagonatum,0,1600
AB120309.1.1800,AB120309.1.1800,4442,Camellia sinensis,0,1700
AB120002.1.1725,AB120002.1.1725,244961,Gyrodinium fusiforme,0,1800
AB181890.1.1709,AB181890.1.1709,281610,Protoperidinium denticulatum,0,1800
$
Not fancy but gets the job done
#!/usr/bin/perl
use strict;
my #data = `cat /var/tmp/test.in`;
my %genuses = ();
foreach my $line ( #data ) {
chomp($line);
my #splitline = split(',', $line);
my $genus = $splitline[3];
my $num = $splitline[5];
my ( $name, $extra ) = split(' ', $genus);
if ( exists $genuses{$name}->{'num'} ) {
if ( $genuses{$name}->{'num'} < $num ) {
$genuses{$name}->{'num'} = $num;
$genuses{$name}->{'line'} = $line;
}
else {
next;
}
}
else {
$genuses{$name}->{'num'} = $num;
$genuses{$name}->{'line'} = $line;
}
}
foreach my $genus ( %genuses ) {
print "$genuses{$genus}->{'line'}";
print "\n";
}
Output:
[root#localhost tmp]# ./test.pl
AB179736.1.1725,AB179736.1.1725,278986,Pterocorys zancleus,0,1763
AB179735.1.1711,AB179735.1.1711,278983,Eucyrtidium hexagonatum,0,1600
AB120309.1.1800,AB120309.1.1800,4442,Camellia sinensis,0,1700
AB120002.1.1725,AB120002.1.1725,244961,Gyrodinium fusiforme,0,1800
AB181890.1.1709,AB181890.1.1709,281610,Protoperidinium denticulatum,0,1800
Don't see an obvious method that you are sorting your output by
I am new to Perl and I am trying to define a 2D array as an attribute of my class in Perl. I define my class as follows,
sub new{
my $class = shift;
my $self = {};
my #board = [];
for (my $i = 0; $i < 8; $i++){
for(my $j = 0; $j < 8; $j++){
$board[$i][$j] = '.';
}
}
$self->{board} = #board;
bless($self, $class);
return $self;
}
But later on when I try to access the board field like this
$self->{board}[$i][$j] = ' ';
I got an error saying
Can't use string ("8") as an ARRAY ref while "strict refs" in use
Can anyone tell me what is the correct way of doing this? I do not want to just delete use strict.
I changed your code to what I'm sure was your intention,
see the lines changed and comment # not
sub new{
my $class = shift;
my $self = {};
my #board = (); # not []
for (my $i = 0; $i < 8; $i++){
for(my $j = 0; $j < 8; $j++){
$board[$i][$j] = '.';
}
}
$self->{board} = \#board; # not #board
bless($self, $class);
return $self;
}
or
sub new{
my $class = shift;
my $self = {};
my $board = []; # not #board
for (my $i = 0; $i < 8; $i++){
for(my $j = 0; $j < 8; $j++){
$board->[$i][$j] = '.';
}
}
$self->{board} = $board; # not #board
bless($self, $class);
return $self;
}
about your my #board=[]; is the same as =([],); assign a list (that perl calls ARRAY) whose first element is a reference to an ARRAY to #board, but this is neither what make your code fail because you overwrite this empty array reference allocation and assignment to position zero.
The #board is a list not a reference to it as $self->{board} expect
You need to place a reference to array inside your $self hash. Right now you're placing a value of array in scalar context - which is its length 8. Of course you can't later use this as a reference to anything.
$self->{board} = \#board;
Others have given you explanations of what the problem is with your constructor. I'll add, that you can simplify it a bit by omitting the $board variable and using C-style loops.
sub new {
my $class = shift;
my $self = {};
$self->{board} = [];
for my $i (1 .. 8) {
for my $j (1 .. 8) {
$self->{board}[$i][$j] = '.';
}
}
return bless $self, $class;
}
I'd also add the following three methods which make it easier to set and get the elements of the board:
sub board {
my $self = shift;
return $self->{board};
}
sub set_board_element {
my $self = shift;
my ($i, $j, $val) = #_;
$self->board->[$i][$j] = $val;
}
sub get_board_element {
my $self = shift;
my ($i, $j) = #_;
return $self->board->[$i][$j];
}
Have you considered using Moose to write your class? It will make your life easier. In particular, Array traits seem like a good fit for your problem.
I have an array with contain values like
my #tmp = ('db::createParamDef xy', 'data $data1', 'model $model1', 'db::createParamDef wl', 'data $data2', 'model $model2')
I want to create a hash of hashes with values of xy and wl
my %hash;
my #val;
for my $file(#files){
for my $mod(#tmp){
if($mod=~ /db::createParamDef\s(\w+)/){
$hash{$file}="$1";
}
else{
my $value = split(/^\w+\s+/, $mod);
push (#val,$values);
}
$hash{$fname}{$1}="#val";
#val=();
}
}
this returns me only the filename and the value of $1, but i'm expecting output to be like this:
%hash=(
'filename1'=>
{
'xy'=>'$data1,$model1',
}
'filename2'=>
{
'wl'=>'$data2,$model2',
}
)
where am I doing wrong?!
This was actually a pretty tricky problem. Try something like this:
#!/bin/perl
use strict;
use warnings;
my #tmp = ('db::createParamDef xy', 'data $data1', 'model $model1', 'db::createParamDef wl', 'data $data2', 'model $model2');
my #files = ('filename1', 'filename2');
my %hash;
my #val;
my $index = 0;
my $current;
for my $mod (#tmp) {
if ( $mod=~ /db::createParamDef\s+(\w+)/){
$current = $1;
$hash{$files[$index]}={$current => ""};
$index++;
#val=();
} else {
my $value = (split(/\s+/, $mod))[1];
push (#val,$value);
}
$hash{$files[$index - 1]}{$current} = join(",", #val);
}
use Data::Dumper;
print Dumper \%hash;
Let me know if you have any questions about how it works!
my #tmp = (
'db::createParamDef xy', 'data $data1', 'model $model1',
'db::createParamDef wl', 'data $data2', 'model $model2'
);
my $count = 0;
my %hash = map {
my %r;
if (my($m) = $tmp[$_] =~ /db::createParamDef\s(\w+)/) {
my $i = $_;
my #vals = map { $tmp[$i+$_] =~ /(\S+)$/ } 1..2;
$r{"filename". ++$count}{$m} = join ",", #vals;
}
%r;
} 0 .. $#tmp;
use Data::Dumper; print Dumper \%hash;
output
$VAR1 = {
'filename1' => {
'xy' => '$data1,$model1'
},
'filename2' => {
'wl' => '$data2,$model2'
}
};
If I have the following array
my #header_line = ('id', 'name', 'age');
How do I create a hash from it equivalent to the line below?
my %fields = { id => 0, name => 1, age => 2};
The reason I want to do this is so that I can use meaningful names rather than magic numbers for indexes. For example:
$row->[$fields{age}]; # rather than $row->[2]
my %fields;
#fields{#header_line} = (0 .. $#header_line);
my %fields = map { $header_line[$_] => $_ } 0..$#header_line;
You said in reply to a comment that this is coming from Text::CSV. This module has a way to import this into a hash for you.
$csv->column_names( #header_line );
$row = $csv->getline_hr( $FH );
print $row->{ 'id' };
my %fields = ();
for (my $i = 0; $i < scalar(#header_line); $i++) {
$fields{$header_line[$i]} = $i;
}
TIMTOWTDI
my %fields = ();
foreach my $field(#header_line)
{
$fields{$field} = scalar(keys(%fields));
}