in reply to LineFit.pm error due to undef value

RTFM! 

$lineFit->setData(\@x, \@y)

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Explaining why it should be like this is something probably best left to the tutorials.

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Re^2: LineFit.pm error due to undef value
by jdporter (Paladin) on Nov 20, 2007 at 15:48 UTC

    I'll add (thought I expect this will go right over your head) that you don't even need to deref and reref the arrays: 

    sub correlation
{
  . . .
  my( $x_ref, $y_ref ) = @_;     
  my $lfit = Statistics::LineFit->new();
  $lfit->setData( $x_ref, $y_ref );
  . . .
}

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