Dears,
I would like to count the number of "(" and ")" that occur in a file.
(syntax checking script). I tried to use "grep -c" and this works fine as long as there is only one character (for which I do a search) on a line.
Has anyone an idea how I can count the number of specific characters... (6 Replies)
I have a comma delimited file that roughly has 300 fields. Not all fields are populated.
This file is fed into another system, what I need to do is count the amount of characters in each field and give me an output similiar to this:
1 - 6,2 - 25
The first number is the field and the second... (2 Replies)
I want to list the occurence of particular characters in a line. my file looks like this
a,b,c,d
e,f,g
h,y:e,g,y s
f;g,s,w
and I want to count how many commas are in each line so the file in the end looks like this:
a,b,c,d 3
e,f,g 2
h,y:e,g,y s 3
f;g,s,w ... (2 Replies)
Hi All,
I need some help in counting the number of letters in a big file with separations.
Following is the file I have
>AB_1
MLKKPIIIGVTGGSGGGKTSVSRAILDSFPNARIAMIQHDSYYKDQSHMSFEERVKTNYDHPLAFDTDFM
IQQLKELLAGRPVDIPIYDYKKHTRSNTTFRQDPQDVIIVEGILVLEDERLRDLMDIKLFVDTDDDIRII... (6 Replies)
Ok say I wanted to count every Y in a data file.
Then set Y as my delimiter so that I can separate my file by taking all the contents that occur BEFORE the first Y and store them in a variable so that I may use this content later on in my program. Then I could do the same thing with the next Y's... (5 Replies)
I do have a big file in the following format
>A1
ATGCGG
>A2
TCATGC
>A3
-TGCTG
The number of characters will be same under each subheader and only possible characters are A,T,G,C and -
I want to count the number of A's, T's,G's, C's & -'s vertically for all the positions so that I... (5 Replies)
Hi All, here's a question from newbie
I have a data like this, which set of small DNA sequences separated by new line
GAATCCGGAAACAGCAACTTCAAANCA
GTNATTCGGGCCAAACTGTCGAA
TTNGGCAACTGTTAGAGCTCATGCGACA
CCTGCTAAACGAGTTCGAGTTGAANGA
TTNCGGAAGTGGTCGCTGGCACGG
ACNTGCATGTACGGAGTGACGAAACCI... (6 Replies)
Discussion started by: amits22
6 Replies
LEARN ABOUT DEBIAN
devel::refcount
Devel::Refcount(3pm) User Contributed Perl Documentation Devel::Refcount(3pm)NAME
"Devel::Refcount" - obtain the REFCNT value of a referent
SYNOPSIS
use Devel::Refcount qw( refcount );
my $anon = [];
print "Anon ARRAY $anon has " . refcount($anon) . " reference
";
my $otherref = $anon;
print "Anon ARRAY $anon now has " . refcount($anon) . " references
";
DESCRIPTION
This module provides a single function which obtains the reference count of the object being pointed to by the passed reference value.
FUNCTIONS
$count = refcount($ref)
Returns the reference count of the object being pointed to by $ref.
COMPARISON WITH SvREFCNT
This function differs from "Devel::Peek::SvREFCNT" in that SvREFCNT() gives the reference count of the SV object itself that it is passed,
whereas refcount() gives the count of the object being pointed to. This allows it to give the count of any referent (i.e. ARRAY, HASH,
CODE, GLOB and Regexp types) as well.
Consider the following example program:
use Devel::Peek qw( SvREFCNT );
use Devel::Refcount qw( refcount );
sub printcount
{
my $name = shift;
printf "%30s has SvREFCNT=%d, refcount=%d
",
$name, SvREFCNT($_[0]), refcount($_[0]);
}
my $var = [];
printcount 'Initially, $var', $var;
my $othervar = $var;
printcount 'Before CODE ref, $var', $var;
printcount '$othervar', $othervar;
my $code = sub { undef $var };
printcount 'After CODE ref, $var', $var;
printcount '$othervar', $othervar;
This produces the output
Initially, $var has SvREFCNT=1, refcount=1
Before CODE ref, $var has SvREFCNT=1, refcount=2
$othervar has SvREFCNT=1, refcount=2
After CODE ref, $var has SvREFCNT=2, refcount=2
$othervar has SvREFCNT=1, refcount=2
Here, we see that SvREFCNT() counts the number of references to the SV object passed in as the scalar value - the $var or $othervar
respectively, whereas refcount() counts the number of reference values that point to the referent object - the anonymous ARRAY in this
case.
Before the CODE reference is constructed, both $var and $othervar have SvREFCNT() of 1, as they exist only in the current lexical pad. The
anonymous ARRAY has a refcount() of 2, because both $var and $othervar store a reference to it.
After the CODE reference is constructed, the $var variable now has an SvREFCNT() of 2, because it also appears in the lexical pad for the
new anonymous CODE block.
PURE-PERL FALLBACK
An XS implementation of this function is provided, and is used by default. If the XS library cannot be loaded, a fallback implementation in
pure perl using the "B" module is used instead. This will behave identically, but is much slower.
Rate pp xs
pp 225985/s -- -66%
xs 669570/s 196% --
SEE ALSO
o Test::Refcount - assert reference counts on objects
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2011-11-15 Devel::Refcount(3pm)