Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid
 
PerlMonks  

Re^2: How to print the lines immediately above and below a matching line?

by Bio90 (Initiate)
on Nov 25, 2012 at 13:36 UTC ( #1005489=note: print w/ replies, xml ) Need Help??


in reply to Re: How to print the lines immediately above and below a matching line?
in thread How to print the lines immediately above and below a matching line?

Hi, thanks for your reply.

I am trying to match from the DATA handle.


Comment on Re^2: How to print the lines immediately above and below a matching line?
Download Code
Re^3: How to print the lines immediately above and below a matching line?
by Anonymous Monk on Nov 25, 2012 at 13:40 UTC
    Maybe you should read a line from that handle instead ... don't skip the basics, read perlintro
      I'm sorry, I am a Biology student and I have merely had perl suggested to me as a means to an end in order to get my data into a usable format.

        I'm sorry, I am a Biology student and I have merely had perl suggested to me as a means to an end in order to get my data into a usable format.

        Right, and you're merely trying to write a perl program -- might as well learn the basics of the syntax, like what goes in a match operator is not an attempt to read from a filehandle -- you have to separate the steps

        Are you sure an already written perl program, say something from the bioperl.org website wasn't suggested instead?

Re^3: How to print the lines immediately above and below a matching line?
by toolic (Bishop) on Nov 25, 2012 at 13:41 UTC
    Then you need to change your code. Something like:
    my $data = <DATA>; chomp $data; if ($this_line =~ /\Q$data/)
      I have tried that but it has returned a "Use of uninitialised value $data". I do not understand - surely $data is initialised by my $data = <DATA>;?

        Show that code? Where did you add the line?

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1005489]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others chanting in the Monastery: (12)
As of 2015-07-02 11:04 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (34 votes), past polls