array to string conversion.

prensrf has asked for the wisdom of the Perl Monks concerning the following question:

Hi,

Sorry for the poor title, my inability to describe my problem is probably why I haven't been able to search for a suitable answer to the issue.

Basically I have been trying to compare values held in multiple lists and generate some output based on the position in the list of the match.

After some searching around I came across an interesting snippet of code using Algorithm::NeedlemanWunsch

However, this is the problem. The Snippet uses scalars as the input. . .

my $arr1 = [qw(A T C G T C G A G C G)];
my $arr2 = [qw(A C G T C C T G T C G)];
[download]

and I have the values I need to push into the algorithm in two @lists

Can anyone suggest a way to mangle my @lists into a suitable scaler in the above format?

Thanks in advance

Rich

Comment on array to string conversion. Select or Download Code

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Re: array to string conversion. by choroba (Cardinal) on Dec 09, 2014 at 15:28 UTC
`qw()` creates a list of strings. `[...]` makes it an anonymous array, i.e. an array reference. So, for @list1 and @list2, you can just `my $arr1 = \@list1; my $arr2 = \@list2;` [download] or, if you don't want to work directly with the lists, copy them: `my $arr1 = [ @list1 ]; my $arr2 = [ @list2 ];` [download] لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]
Re: array to string conversion. (perlintro, perlreftut, perldata) by Anonymous Monk on Dec 09, 2014 at 15:30 UTC
perlintro, @list is an array, and so is $arr1, its like `my $list = \@list;` See also references quick reference, hashes are curly Re: How to traverse a two dimentional array in a constructor?, Re: Parsing SOAP::Lite results,, Re: Trouble accessing Hash of Arrays (troubleshooting basics), Re^5: Combining 3 files, { 'hashes', 'are', 'curly', 'ones' } [ 'arrays', 'are', 'square' ] ( 'lists are round' )	[reply] [d/l]
Re: array to string conversion. by Ratazong (Monsignor) on Dec 09, 2014 at 15:30 UTC
You can use join to transform an array into a string split to split a string into an array HTH, Rata	[reply]
Re: array to string conversion. by prensrf (Initiate) on Dec 09, 2014 at 15:42 UTC
Doh! Thanks to all, i'd been struggling to make anything work with join, and it's been a few years since i've done any serious perl coding. The reference worked a treat Thanks again	[reply]
Re: array to string conversion. by sundialsvc4 (Abbot) on Dec 09, 2014 at 16:53 UTC
It’s also sometimes very useful to use Data::Dumper to display for you exactly what a data-structure actually looks like. Although the “actual” world of Perl only contains lists, arrays, and so-on, the presence of “references” (and a very-generous syntax which assumes you know what you want and which gives you more-than-one way to say it) can make it hard to visualize what you’re actually looking-at and/or what you’re actually going to get. The Dumper is a good tool for, “show me...”	[reply]
Re^2: array to string conversion. by Anonymous Monk on Dec 09, 2014 at 17:34 UTC
It’s also sometimes very useful to use... Not when you don't know basic syntax sundialsvc4, you have to learn basic syntax first before DD is useful	[reply]

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