Changes in version 0.16-2 (2024-07-18)                 

BUG FIXES

    o   Fixed C++20 compiler errors, thanks to Prof. Ripley.

                 Changes in version 0.16-1 (2022-04-24)                 

BUG FIXES

    o   Fixed BLAS/LAPACK calls, thanks to Prof. Ripley.

                 Changes in version 0.16-0 (2019-12-01)                 

NEW FEATURES

    o   svds() now supports implicit centering and scaling of the
	matrix via the center and scale parameters in the opts
	argument, suggested by @robmaz (#73 of Spectra).

                 Changes in version 0.15-0 (2019-06-11)                 

NEW FEATURES

    o   Updated Spectra to v0.8.1.

    o   Added support for new matrix types *dsCMatrix* and *dsRMatrix*
	to handle sparse and symmetric matrices, contributed by
	@flying-sheep (#16).

    o   eigs() now detects the symmetry of *dgRMatrix* matrices.

BUG FIXES

    o   Improved the documentation about the relationship between SVD
	and eigen decomposition for symmetric matrices, thanks to
	@alexpghayes (#17).

    o   (Internal) Replaced the deprecated Eigen::MappedSparseMatrix
	class in the C++ code.

                 Changes in version 0.14-0 (2019-04-04)                 

NEW FEATURES

    o   Updated Spectra to v0.8.0.

    o   New parameter opts$initvec in eigs() and eigs_sym() to allow
	users supplying the initial vector for the algorithm.

                 Changes in version 0.13-1 (2018-05-22)                 

BUG FIXES

    o   Updated Spectra to v0.6.2 that fixes regressions in v0.6.1 on
	some edge cases.

                       Changes in version 0.13-0                        

NEW FEATURES

    o   Using prettydoc to format vignette.

    o   Updated Spectra to v0.6.1 that improves numerical accuracy of
	eigen-solvers.

BUG FIXES

    o   Registered native routines per CRAN's policy.

                 Changes in version 0.12-0 (2016-06-12)                 

NEW FEATURES

    o   Now svds() supports user-defined implicit matrix that is
	specified by two functions, A and Atrans, which calculate the
	matrix multiplication and transpose multiplication
	respectively.

    o   Added a package vignette.

                 Changes in version 0.11-0 (2016-02-29)                 

NEW FEATURES

    o   New package to supersede rARPACK to avoid name confusion.

    o   Imported from rARPACK 0.10-0.

BUG FIXES

    o   Improved numerical stability.

    o   Fixed convergence failure for matrices that have repeated
	eigenvalues.

                       Changes in version 0.10-0                        

BUG FIXES

    o   Updated the backend Spectra library, which fixed the
	compatibility with Eigen >= 3.2.6.

                        Changes in version 0.9-0                        

BUG FIXES

    o   Fixed a bug that causes the algorithm not converging on some
	matrices.

                        Changes in version 0.8-1                        

BUG FIXES

    o   Fixed a compilation problem on Solaris.

                        Changes in version 0.8-0                        

NEW FEATURES

    o   The backend program is now changed from ARPACK to Spectra,
	which brings cleaner code and better performance.

    o   eigs_sym() now accepts more matrix types.

    o   Added a C interface for other packages to link to.

BUG FIXES

    o   Fixed a bug reported by xshi19 (#8).

    o   Fixed a performance issue reported by swajnautcz (#10).

                        Changes in version 0.7-0                        

NEW FEATURES

    o   Support for implicit matrix, contributed by Jiali Mei.  User
	can supply a function FUN rather than an explicit matrix to
	eigs(), and the eigenvalues/eigenvectors of this operator will
	be computed. FUN(x, args) must return a vector of the same
	length as x.

    o   eigs() will test the symmetry of matrix before actual
	computation, since symmetric matrices can guarantee real
	eigenvalues and eigenvectors, and the numerical result is more
	stable.

BUG FIXES

    o   C++ code of svds() is completely rewritten. Now it is more
	readable and easier to maintain.

    o   Fix a bug possibly coming from ARPACK, which sometimes gives
	incorrect result of complex eigenvectors.

    o   Avoid using a C random number generator.

                        Changes in version 0.6-0                        

NEW FEATURES

    o   Add support for new matrix types: *dgeMatrix* and *dgRMatrix*.

    o   eigs() now allows a full Eigen Decomposition, meaning that all
	the eigenvalues are calculated. In this case eigs() is simply a
	wrapper of eigen(), and with a warning issued.

    o   Ditto for svds().

BUG FIXES

    o   Rewrite C++ code using classes and templates.

    o   Fix errors in checking the values of k and ncv.

                        Changes in version 0.5-0                        

NEW FEATURES

    o   Add svds() function to calculate truncated SVD.

BUG FIXES

    o   Now sort eigenvalues in decreasing order.

    o   Rename eigs.sym() to eigs_sym() to avoid confusion.

    o   Fix a matrix out-of-bound error.

                        Changes in version 0.4-0                        

NEW FEATURES

    o   Implement shift-and-invert mode for all supported eigen
	problems.

BUG FIXES

    o   Update arpack-ng to 3.1.4.

                        Changes in version 0.3-0                        

NEW FEATURES

    o   Now eigs() supports real symmetric matrices.

                        Changes in version 0.2-0                        

NEW FEATURES

    o   Now eigs() supports sparse real nonsymmetric matrices of the
	class *dgCMatrix*, defined in the Matrix package.

                        Changes in version 0.1-0                        

NEW FEATURES

    o   Initial version. For now eigs() supports dense real
	nonsymmetric matrices.