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EigenvalueDecomposition class problems and fixes??

MathNet.Numerics.LinearAlgebra.EigenvalueDecomposition. I downloaded MathNet.Iridium-2008.8.16.470 to try it for some Eigenvalue work, and had 2 problems in SymmetricDiagonalize( ). First, a Matrix like: { 5 -2 -4 } { -2 2 2 } { -4 2 5 } (these are rows) would throw an IndexOutOfBounds Exception, because...

Posted to Math.NET Mathematics Library (Forum) by Leon Bass on 10-05-2009
Extreme Slowdown with Math.NET

In my code I have a block which executes once only: if(doOnce) { Matrix matrix; doOnce = false; } However, I find that when even just a matrix object is created in this block once only, even if it does nothing the entire rest of the program is doomed to execute about three times slower than if the matrix...

Posted to Math.NET Mathematics Library (Forum) by Superfish on 10-03-2009
Sparse matrix in Iridium

Hello, I found about Math.NET while searching for a SparseMatrix .NET implementation. Google found this link here: http://nmath.sourceforge.net/doc/numerics/MathNet.Numerics.LinearAlgebra.Sparse.html so I downloaded both the newest version and the intermediate release of Iridium but I could not find...

Posted to Math.NET Mathematics Library (Forum) by ProhibitedUser on 06-26-2009
Problems on eigenvalue computation

Hi Seems the 470 reversion has problems in calculating the eigenvalues for Sigular Matrix, if the bug is fixed,I am looking forward to have the newest reversion. Maybe what I need hardly now is the dlls for my current project. I could not download the build version of Mathnet through SVN, I don't...

Posted to Math.NET Mathematics Library (Forum) by youyiz on 09-29-2008
Re: Complex vectors & matrices

I'm currently working on complex vectors and matrices. I started to implement them independently (i.e. a new non-generic type ComplexMatrix and ComplexVector), but I agree that it would make sense to share a generic interface. Unfortunately this might be a breaking change. I expect that by now most...

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 05-22-2008
Additional functions for the classes "matrix" and "vector"

Hi! At first I want to say, that I'm very glad to have found your libary. it is very helpful. - I'm missing some functions. Maybee they are allready implemented and I'm just not fit enough to find them. In case they are really missing, I want to suggest the following function to enhance the...

Posted to Math.NET Mathematics Library (Forum) by marX on 04-16-2008
Bug in Matrix.CopyToArray() method

Hello, I found a small "copy/paste" bug in the CopyToArray() method of the Matrix class (MathNet.Iridium-2008.3.12.405): File: LinearAlgebra/Matrix.cs Line: 405 for(int j = 0; i < _columnCount; j++) It should be j, not i. Thanks! - BB

Posted to Math.NET Mathematics Library (Forum) by BBen on 04-03-2008
Re: Positive Definite Test

Some other missing properties that might be interesting to provide: see older forum post . I'll create some feature requests in the tracker for them.

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 03-30-2008
Re: How can i convert a matrix to a multidimensional array

Use the CopyToArray() Method. Note however, that matrices now use jagged arrays internally, not multidimensional arrays (was changed in this version). If your use case allows you to use jagged arrays, too, you would probably get much better performance (jagged arrays are faster in general, and you would...

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 02-08-2008
Re: Matrix class performance

I've submitted some changes on the matrix class (and dependencies) today, so it now uses jagged arrays, as you suggested. Indeed, I observed nearly 50% perf improvement on the included small Solve perf analysis project. You may want to have a look at the changes first before updating your local SVN...

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 10-14-2007

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