The error occurs in the module, but the coding error is actually located in your calling program. When you do this: 
my @vector = (4.3125, 0.4375);
push @AoA, @vector;
@vector = (4.375, 0.375);
push @AoA, @vector;

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you are not creating an array of arrays (AoA), but a simple array whose 4 elements are: 
(4.3125, 0.4375, 4.375, 0.375)

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You need to push on @AoA a reference to @vector: 
my @vector = (4.3125, 0.4375);
push @AoA, \@vector;
@vector = (4.375, 0.375);
push @AoA, \@vector;

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or build directly an array reference: 
push @AoA, [4.3125, 0.4375];
push @AoA, [4.375, 0.375];

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I guess this should solve your issue.

As I said earlier, you should avoid using the $a and $b variables, they are special variables used among other things for sorting, they behave differently from other variables, and using as you do them might lead to difficult-to-track bugs. You may use $c or $d, if you like, this will not be a problem, but I would personally put a more meaningful name helping comprehension of what they represent.

Update: As pointed below by farang the first method above for building an AoA is actually buggy. Use the second one. Thanks to farang for picking that.

In reply to Re^5: enumerating values for slopes by Laurent_R
in thread enumerating values for slopes by Aldebaran

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