Can't use an undefined value as an ARRAY reference

techperl has asked for the wisdom of the Perl Monks concerning the following question:

Hi,
I am getting below mentioned error, for which I couldn't find any solution.

>Can't use an undefined value as an ARRAY reference at line 668.

Code at line 668,
for ( my $i = 0; $i < scalar( @{$dataSet{results}} ); $i++ )

Kindly provide me a solution.....

Thanks.

Comment on Can't use an undefined value as an ARRAY reference

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Re: Can't use an undefined value as an ARRAY reference by Corion (Patriarch) on Jan 09, 2009 at 08:28 UTC
Obviously, `$dataSet{results}` is not defined. See Data::Dumper for dumping the contents of `%dataSet`.	[reply] [d/l] [select]
Re: Can't use an undefined value as an ARRAY reference by andye (Curate) on Jan 09, 2009 at 10:03 UTC
You might also find 'use diagnostics;' useful - put this at the top of your program and it'll give you more explainey error messages.	[reply]
Re^2: Can't use an undefined value as an ARRAY reference by Anonymous Monk on Mar 17, 2010 at 06:08 UTC
Hello, if $dataSet{results} is parsed from a user input file for example, and we would want to give user the flexibility of defining and not defining this array depending on their applications, is there a way I could get around this without getting the error of "undefined value as an ARRAY reference" ? Thanks!	[reply]
Re: Can't use an undefined value as an ARRAY reference by perlthirst (Scribe) on Jan 09, 2009 at 09:21 UTC
there is no value available in $dataSet{results}. print this and check whether Array Ref is available or not.	[reply]