Okay, so I have a template program from Beginning Perl for Bioinformatics, example 4 - 4. However, it works for calculating the reverse complement of a DNA strand given a predetermined DNA sequence in scalar. I want to write the initial DNA sequence with a standard input command from the user because I love the function. I have tried initializing the STDIN function from an array, and then joining it to a scalar.
@DNA = ;
$DNA = join(' ', @DNA);
I'm new to programming, so I think there is something wrong with my syntax.
Thank you so much!
If you need a template its attached. Also, it would probably be a good idea to activate strict warnings.
Hi,
Change your code from
@DNA = ;
$DNA = join(' ', @DNA)
to
$DNA = ;
chomp($DNA);
PERL uses chomp to remove newline from end string. Hope this help
I highly recommend writing the code, such that it is evident what is going on, e.g.:
#!/usr/bin/perl -w
use strict;
my $DNA = '';
while( defined( my $line = ) ){
chomp($line);
$DNA .= $line;
}
print $DNA, "\n";
Hint: Readling line-by-line allows you to work on files one line at a time, which is much more memory efficient than simply reading the entire file into an array!
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