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Hi Monks!

Alright, I do not have any formal training in computer science, so bear with me please. I use perl code in my job to do complex sorts and data mining. I have a job which I think is best handled with recursion, yet I have never really used this technique in perl, so I am getting lots of errors. What I have is a tab delimited file with three columns.

Basically, the first column gives the name of a network element, the second column gives a related network element, and the third column gives how the two are related. The only options for the third column are activate or inhibit. I want to systematically inhibit all network objects(one at a time) and output all the affected objects. The tab delimited file is called useful_dat.tab.

The recursive code that I have is as follows,
my @activated; my @inhibited; my $object=test_element; &inhibited_rec($object); print "@activated\n"; print "@inhibited\n"; sub inhibited_rec{ my @a=`awk '\$1 ~ /$_[0]/' useful_dat.tab |cut -f 2,3|sort|uniq`; foreach (@a){ my @b=split(/\t/,$_); if($b[1] eq 'Activation'){ } else{ push (@activated,$b[0]); &activated_rec($b[0]); } } } sub activated_rec{ my @a=`awk '\$1 ~ /$_[0]/' useful_dat.tab |cut -f 2,3|sort|uniq`: foreach (@a){ my @b=split(/\t/,$_); if($b[1] eq 'Activation'){ push (@activated,$b[0]); &activated_rec($b[0]); } else{ push (@inhibited,$b[0]); &inhibited_rec($b[0]); } } }

Some of the details of the code are not included here for clarity. The errors I get involve the variable declarations @a,@b,@activated,@inhibited. Can you please help me figure out how to do this correctly? Or if what I want to do is not possible/very hard in perl, please let me know.


In reply to Perl Recursion by azheid

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