You need to tell us more about the context of your query... here are a few questions you might want to preempt --

• what are these polygons? (I am assuming geographic as from a GIS or as created by a drawing program such as Omnigraffle or Illustrator, etc.)
• how are you getting these values?
• what do you mean by "compare the polygons from 2 files"? compare for what? congruency? similarity?

If the above are simply x,y coords, the polys will be different if even one coord pair mismatches -- heck, just loop over the two data files and compare line by line -- after all, each coord is on its own line.

Please provide more context, and I sure you will find help here. Also, you might want to retitle your post -- it is as much about comparing files as it is about asking for appropriate modules on CPAN. Which answer are you looking for?

Good luck.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, 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, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.