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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
Complex Eigenvectors

Hi, Thanks for the package!! I was just wondering: I can get complex eigenvalues of a matrix, but I can't seem to get complex eigenvectors also. Are they there and I just don't see them, or is that not built into the library? Thanks

Posted to Math.NET Mathematics Library (Forum) by sstaple on 02-12-2009
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: Polynomial Extrapolation - How to...

Instead of an extrapolation I'd suggest to go with a least-aquares regression on one of these polynomials (3rd or maybe also 4th order). Interpolation/Extrapolation: You try to fit a curve exactly through all available data points. Least Squares Fitting: You try to fit a simpler curve close to a...

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 08-22-2008
Scalar operations for vector

Is there any objections against adding operators for addition of scalars to vectors? #region Arithmetic Operator Overloading /// <summary> /// Addition of scalar to a vector /// </summary> public static Vector operator +( Vector v, double s ) { for (int i = 0; i < v.Length; i++) { v._data...

Posted to Math.NET Mathematics Library (Forum) by Christo on 05-21-2008
Bug: The crossproduct has wrong indexs.

Hi! Me again with a bug (at least I think so). /// <summary> /// Cross product of two 3-dimensional vectors. /// </summary> /// <returns> /// Vector ret = (u[2]v[3] - u[3]v[2], u[3]v[1] - u[1]v[3], u[1]v[2] - u[2]v[1]). /// </returns> /// <seealso cref="CrossMultiply"...

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

Thanks for reporting! Confirmed and tracked as IRID-124 . I think I should raise the priority of writing more unit tests of already existing code...

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 04-04-2008

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