Re: Use of uninitialized value error

The warning simply means the variable's value is undef.

If $FastaSeqOfDataBase is undefined, then $ArrayFasta[2] is undefined.

If $ArrayFasta[2] is undefined, then the split returned fewer than three strings.

If the split returned fewer than three strings, then $Data contains fewer than two double quotes.

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Re^2: Use of uninitialized value error by sumeetgrover (Monk) on Jul 04, 2011 at 20:14 UTC
Have you used strict at the beginning of the program? I would suggest that. If you already have used strict at the beginning of the program, then I do not see you having 'declared' the variable `$FastaSeqOfDataBase` with `my`. If this doesn't help, I'd suggest the classic 'Static Verification' technique to dry-run the code with sample data and determine what might cause the error. Hope this helps!	[reply] [d/l] [select]
Re^2: Use of uninitialized value error by birdy (Initiate) on Jul 04, 2011 at 20:20 UTC
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Re^3: Use of uninitialized value error by ikegami (Patriarch) on Jul 04, 2011 at 20:36 UTC
And what are you proposing to do as a solution? You haven't said enough for us to identify the problem, much less give a solution. I'm guessing the problem is either a bad assumption about the format of the file or an incorrect parsing of the file.	[reply]
Re^4: Use of uninitialized value error by birdy (Initiate) on Jul 04, 2011 at 20:42 UTC
To tell you the truth i haven't understand too much about what are you writing in the previous message.i am begginer in perl programming...	[reply]
Re^5: Use of uninitialized value error by ikegami (Patriarch) on Jul 04, 2011 at 20:57 UTC
Re^5: Use of uninitialized value error by ikegami (Patriarch) on Jul 04, 2011 at 20:52 UTC
Re^3: Use of uninitialized value error by birdy (Initiate) on Jul 04, 2011 at 20:35 UTC
I forget to write it down but i do `my $FastaSeqOfDataBase = "";` in some lines before i call it.	[reply] [d/l]
Re^4: Use of uninitialized value error by sumeetgrover (Monk) on Jul 04, 2011 at 20:46 UTC
A very quick method of finding out issues can be introducing temporary 'print' statements in the code. So you could print the value of `$FastaSeqOfDataBase` after it is assigned a value in the code snippet you pasted. Then see if the value is still undef. The log message you've pasted suggests that your code is over 500 lines long, so I guess to one extent it might be difficult for you to put a lot of other background information here.	[reply] [d/l]