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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
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
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: About calculating eigenvector and values....

I've just added a small sample in the code sample section in the wiki: http://mathnet.opensourcedotnet.info/doc/IridiumCodeSamples.ashx

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 04-03-2008
Re: Extrapolation IndexOutOfRangeException

This is a bug, thanks for reporting. It is tracked as IRID-119 . I was able to repro it, and fixed it in revision 410.

Posted to Math.NET Mathematics Library (Forum) by Christoph Rüegg on 04-02-2008
Positive Definite Test

I have been going over the code, and maybe I am just thick, but do any of the decompositions that require it perform a test for positive definiteness (or semi-definiteness?). I notice there is a TODO in the Cholesky decomposition class about it? If not, would you want me to write a method in the Matrix...

Posted to Math.NET Mathematics Library (Forum) by Matthew Kitchin on 03-26-2008
Matrix data structure optimization: Nearly 50% perf gain

Some time ago I did some very basic performance analysis of solving linear equation systems with Iridium. Since then we decided to rewrite the Matrix class to use jagged arrays instead of rectangular ones, see this forum discussion . There already was a discussion about that issue some long time ago...

Posted to Math.NET Project News (Weblog) by Christoph Rüegg on 10-14-2007
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

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