Searching for "jacobi method" finds passing mention in PDLA::MatrixOps, but if you perhaps asked a more specific question with sample code showing what you're attempting to do you might get a more germane (or possibly even useful) reply.

As for your second question, yes; see perlxs or Inline::C for example. In general you'd want to search CPAN first because if you're wanting to use an open source C library there's a good chance someone's written a module wrapping it already.

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re: Jacobi Method by Fletch
in thread Jacobi Method by Lucero

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