Perl arrays store scalar values. Scalar values are things like numbers, strings and references. When you copy an array (which includes push, pop and so on) you copy the scalar values of the elements. In a sense Perl doesn't do multiply dimensioned arrays. Instead it allows you to have an array of references to other (lets call them 'owned') arrays. When you copy an array of arrays you only copy the references so you end up with two arrays containing references to the same collection 'owned' arrays.
You need to provide a way to make a deep copy of the data. Data::Deep may help (I've not used it). It may also be worth looking at PDL which is designed for data manipulation in Perl.
BTW, I strongly endorse the other comments relating to using 'my' and package variables. Most likely if stuff broke when you used 'my' strict was highlighting either a bug or a design problem in your code.
Perl is the programming world's equivalent of English
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
Outside of code tags, you may need to use entities for some characters:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||