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→Sparse Matrices: Move SPQR Interface project from Summer of Code - Getting Started.
(→GUI/IDE: Move "GUI Variable Editor and Property Inspector" here from Summer of Code - Getting Started.) |
(→Sparse Matrices: Move SPQR Interface project from Summer of Code - Getting Started.) |
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The paper by [http://arxiv.org/abs/cs.MS/0604006 Bateman & Adler] is good reading for understanding the sparse matrix implementation. | The paper by [http://arxiv.org/abs/cs.MS/0604006 Bateman & Adler] is good reading for understanding the sparse matrix implementation. | ||
*Improve Matlab compatibility for {{manual|sprandsym}}. | *Improve Matlab compatibility for {{manual|sprandsym}}. | ||
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**minres | **minres | ||
**symmlq | **symmlq | ||
== SPQR Interface == | |||
Octave implements QR factorization for sparse matrices, but it does so with an older "CXSPARSE" library. This has caused fundamental issues, including segfaults as recorded here (bugs {{bug|51950}} and {{bug|57033}}). The goal of this project is to program an interface to the API for the SQPR library (http://faculty.cse.tamu.edu/davis/suitesparse.html). This is the same library that Matlab uses for this purpose. | |||
*Improve QR factorization functions, using idea based on CSPARSE cs_dmsol.m | |||
*Improve QR factorization by replacing CXSPARSE code with SPQR code, and make the linear solve return 2-norm solutions for ill-conditioned matrices based on this new code | |||
=Strings= | =Strings= | ||