use a list to extract out the data...

[liebesie]

Hi,
I'm new to Perl... I have some questions to extract the data out.
I have two files. One is gene list, and the other is the whole data(having gene lists and other values).
I'd like to extract the informations of the input lists.

I tried... but the RESULT file is empty!! I don't know what's wrong...
Here is my code.

#!/usr/bin/perl 

open(Data,"data.txt");
@all = <Data>;
close(Data);

open(List,"list.txt");
@list = <List>;
close(List);

open(ANS,">result.txt");

for($j=0;$j<$#list;$j++){
    
    chomp($list[$j]);

               }

for($i=0;$i<$#all;$i++){

    @b=split("\t",$all[$i]);

   for($j=0;$j<$#list;$j++){
    
    if($b[0] eq $list[$j]){

        print ANS "$all[$i]"; 

               }
         }
}

close(ANS);

Thanks!!!

[toolic]

Since you didn't show any input data, you must debug your own code. Follow the tips in the Perl Basic debugging checklist.

Specifically, you should check the success of each file open, then start adding print statements to your code.

[liebesie]

Hi,
here are my file contents(.jpg).
i've tried use the debugging checklist;
however, it didn't show anything.

[RonB]

You're using the wrong data structure. Instead of 2 arrays, you should use 1 hash.

Load data.txt into a hash where the gene is the key and the value is the related data.

Then loop over list.txt and check if the gene is a key in the hash. If it is, then output the data.

[liebesie]

hi,
i'm really new to Perl. i can't really understand, but i have tried...
here is my code, please tell me where is the problem.

#!/usr/bin/perl

open(Data,"<data.txt");
my %all= <Data>;
my ($key, $value);

open(List,"<list.txt");
my %list = <List>;

open(ANS,">result.txt");

while($all{$key} eq %list) {

        print ANS "%all"; 

               }

close(Data);
close(List);
close(ANS);

[RonB]

It doesn't appear that you understand the basics, so you probably wouldn't understand my descriptions on what you're doing wrong.

You need to start by getting a good beginner level Perl book.

Learning Perl, Fifth Edition

http://oreilly.com/catalog/9780596520113