The full versions of the above code can be found on GitHub. If a more permissive license than LGPL is needed, working to improve Eigen might be the better bet. ![]() If I were starting a new project I might find a way to re-use the architecture of a recent C++11/14 library, like Blaze, and add bindings for SuiteSparse to the back end. I suspect many of the core algorithms could be replaced with much more elegant code using, and with the Parallelism TS you’d have a natural upgrade path to acceleration. When you think about it, operations on sparse matrices come down to manipulating sorted sequences and efficiently handling containers - the bread and butter of the standard library. The resultant pitch would sound the same as the pitch 'F'. The effect of each flat symbol () lowers the pitch of the indicated note a semitone (or half step ), so G double flat is the pitch 'G' lowered by two semitones ( half steps ). The F above high C is high F ( should be in the range of a professional player). G double flat English The musical note 'G' preceded by two flat () symbols. One place where I think Modern C++ could make a big impact in all of these libraries is in the use of standard algorithms. High C is the C two ledger lines above the staff. Notice in this case the “thin” (15x3) Q result is directly available as a sparse matrix, a feature not offered by either Eigen or CSparse. This nomenclature distinguishes C functions that use long ints from those that use ints, something we would normally handle with a template argument in C++.Īs in the CSparse case, I could not find a way to avoid using an intermediate dense matrix (although I did find one library, SuperLU, that can produce a sparse solve output).Ĭholmod_sparse * Q, * R // outputs assert ( SuiteSparseQR ( SPQR_ORDERING_DEFAULT, SPQR_DEFAULT_TOL, 3, A, & Q, & R, nullptr, cc ) >= 0 ) unique_ptr with a custom deleter can handle this as it did in CSparse, though the deleter has to retain a reference to the common object.Īlso note the _l in the functions. cholmod_l_allocate_triplet plays a constructor role as well, and has a complementary cholmod_l_free_triplet “destructor”. It has what amounts to a separate constructor (initializer?) cholmod_l_start and destructor cholmod_l_finish which we can take care of with an RAII wrapper. Notice the mandatory cholmod_common object that is passed to all methods. The musical note 'G' preceded by two flat () symbols. size () // convert triplet matrix to sparse cholmod_sparse * G = cholmod_l_triplet_to_sparse ( Gct, Gentries. ![]() Using namespace Eigen vector > Gentries Gct -> nnz = Gentries.
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