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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: 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

Hi, Thanks very much for your analysis. Your numbers speak a clear language. Interestingly I had just talked with another user about using jagged arrays instead of the rectangular ones some days ago... Looks like we'll have a new matrix base in the next iridium release :) Thanks, Chris PS: Are you...

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 10-08-2007
Re: i need help, Matrix determinant

Have you found out how to create the symbolic matrix? If yes, have a look at the MatrixDeterminant class.

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 10-07-2007
Matrix class performance

I have done some qualitative tests comparing different array types as storage for a Matrix class and have found that the rectangular array is the slowest possible way to implement the Matrix class. The other two options that I considered where jagged arrays (double[][]) and linear arrays(double[]) where...

Posted to Math.NET Mathematics Library (Forum) by gengelb on 10-04-2007
very large matrix to be inverted

dear all, I came across math.net during a struggle to create and invert a very large matrix ( minimum= 5000x5000 and growing to 100000 x 100000) although some figures shown on the website look promissing, i am unable tocreate a matrix larger then 4000x4000 ad even that is with trouble. I keep gtting...

Posted to Math.NET Mathematics Library (Forum) by leon on 09-17-2007
Possible bug in CholeskyDecompostion solve

I think there is a bug is solve method of CholeskyDecomposition. (the GetL() method works fine, though) I tried: double[,] a = { { 25, -5, 10 }, { -5, 17, 10 }, { 10, 10, 62 } }; Matrix m = new Matrix(a); CholeskyDecomposition cd = new CholeskyDecomposition(m); Matrix i = Matrix.Identity(3, 3); Matrix...

Posted to Math.NET Mathematics Library (Forum) by ducky427 on 06-16-2007
Rewrite of Matrix Class

I'm started to write a new Matrix Class that is more powerful than the current one. This is just a try to see how a matrix class that could get implemented. Design Issues: There is a separate partial class that implements general interfaces to make this class as useful as possible. The Class is ...

Posted to Math.NET Mathematics Library (Forum) by MovGP0 on 05-04-2007
Re: Linerar Algebra: Vector class?

Whishes for Matrix: There need to be a function to transform/attach a Vector into/onto a Matrix (ie. to built a coefficient-matrix). Also there should be a enumerator that returns one row of a Matrix after another. The rows can get represented as Vector. The only special Matrix that makes really sense...

Posted to Math.NET Mathematics Library (Forum) by MovGP0 on 04-28-2007

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