Это Math::MatrixReal

[birdwatcher]

Running make test
PERL_DL_NONLAZY=1 /usr/bin/perl5.8.5 "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/adjoint...........ok
t/arith.............ok
t/basic.............ok
t/bench_eigen.......1/4
* Estimated diagonalization time for 100x100 matrix: 7.92 s
Estimated biggest matrix diagonalisable within 1 day cpu: 2144x2144
* Estimated eigenvalues-only computation time for 100x100 matrix: 1.21 s
Estimated biggest matrix manageable within 1 day cpu: 3938x3938
Btw, do you want to crunch such one now? (no, just kidding...;-)
t/bench_eigen.......ok