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Linear algebra package for rust-ndarray using LAPACK binding

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https://en.wikipedia.org/wiki/Matrix_exponential

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following the fix of a long outstanding issue (https://github.com/rust-math/intel-mkl-src/pull/70) this PR bumps `intel-mkl-src` to latest

Hi, Gmres implementation was on the todo list in #107, but has since been stalled. Here is a first draft I have created. It implements Gmres as an iterator, similar...

Arnoldi method is a fundamental component of Krylov subspace method, which is used in sparse matrix context. However, the idea of Arnoldi method can be extended to general linear operators....

The current implementation wants a continuous allocated rhs, an invalid method call 'rhs.as_slice_mut().unwrap()' throws out a confusing runtime message 'called on Option::unwrap() on a None value'. Should it be improved...

The documentation for SolveH says "Note that only the upper triangular portion of the matrix is used.". However it actually uses the lower triangular portion. For example: ```rust let a...

Currently the method factorize_into still allocates a vector for the pivots. This seems normal, but I would like an api where there is no allocation at all. Here is one...

### Issue I have ``` = note: ld: warning: could not create compact unwind for _chseqr_: stack subq instruction is too different from dwarf stack size ld: warning: could not...

I was having a look at the code behind [`LUFactorized`](https://docs.rs/ndarray-linalg/latest/ndarray_linalg/solve/struct.LUFactorized.html) and it appears that there is no LU factorization done at all. For example, the `factorize_into` source is ```rust fn...

I was looking at the history, and it seems like support for `serde` was implemented at one stage (#116), but it appears there is no longer any support for serde....