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The languages used to implement the packages here are C, C++, and Fortran. To some extent the implementation language determines from what language the library can be called: C++ constructs can not be used from C, and if a C routine returns an internally allocated array, this routine cannot directly be used from Fortran. The Petsc library addresses this last point in its Fortran interface.

Victor Eijkhout
Mon Aug 25 17:46:10 PDT 1997