Re: simple but stuck

Hi lolly,

I'm guessing here, but it seems from your code like maybe what you're trying to do is return all lines which are longer than 250 characters? If so, try something like this:

while (<INPUT>) {
    chomp;
    print if length($_) > 250;
}
[download]

If that's not what you want, then could you explain again what the problem is? (particularly, what's a base?)

Anyway, hope that helps.

andy.

Comment on Re: simple but stuck Download Code

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Skip chomp? by RMGir (Prior) on Apr 25, 2002 at 14:50 UTC
`s/chomp;//;` You probably don't want to chomp, or all the printed bases will come out on the same line... -- Mike	[reply] [d/l]
Re: Skip chomp? by andye (Curate) on Apr 25, 2002 at 15:05 UTC
RMGir, you have a good point. `while (<INPUT>) { print if length($_) > 251; }` [download] lolly, note that the number has changed to 251 (250 for the number of bases, plus one for the newline). Andy. Update: Or of course: `while (<INPUT>) { chomp; print $_."\n" if length($_) > 250; }` [download]	[reply] [d/l] [select]
Re: Re: Skip chomp? by demerphq (Chancellor) on Apr 25, 2002 at 15:12 UTC
Lets hope she doesnt have to run this code on a MS machine. Or one of the other machines where $/ is longer than 1 char. Or have it run on multiple systems simultaneously. No the safest way is to use chomp and remove the char. Then determine the length, then put the newline back on for printing. :-) Yves / DeMerphq --- Is $/ the same length on every system?	[reply]
Re: Skip chomp? by demerphq (Chancellor) on Apr 25, 2002 at 15:06 UTC
Actually if portability is a concern than the chomp is vital, but no matter what hes going to have to factor the length of the /n into his length calculation. You are correct however in that he needs to put the newline back on once its been removed. Yves / DeMerphq --- Writing a good benchmark isnt as easy as it might look.	[reply]
NL len not an issue, at least for Win32 by RMGir (Prior) on Apr 25, 2002 at 15:15 UTC
NL len isn't going to be an issue, as long as he doesn't binmode the filehandle. CRLF pairs will be translated to a single LF on input, and translated back going the other way. But if you prefer to chomp then add the newline, that works too :) -- Mike	[reply]
Re: NL len not an issue, at least for Win32 by demerphq (Chancellor) on Apr 25, 2002 at 15:20 UTC
Re: Re: simple but stuck by lolly (Novice) on Apr 25, 2002 at 14:54 UTC
sorry, DNA is composed of four bases A, C, T, G. i will try what you have suggested. lolly	[reply]
Re: Re: Re: simple but stuck by andye (Curate) on Apr 25, 2002 at 15:08 UTC
Can the number on the line before the string of bases ever be longer than 250 digits? If yes, then you need something more sophisticated than my suggestion. Come back to us if it doesn't work. Andy.	[reply]