sci-libs/arpack
Arnoldi package library to solve large scale eigenvalue problems.
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mpi
Global: Adds MPI (Message Passing Interface) layer to the apps that support it
doc
Global: Adds extra documentation (API, Javadoc, etc)
examples
Global: Install examples, usually source code
debug
Global: Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml