Math.NET Numerics

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  1. 2 votes
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      0 comments  ·  Flag idea as inappropriate…  ·  Admin →

      We do some computations in parallel, however, in practice parallel execution is often not very efficient (other than e.g. concurrent execution at application level). However, we should review places where parallelization would be interesting for v3

    • AddSubMatrix

      For FEM analysis the AddMatrix method is very useful. In opposite to SetMatrix this method summarize elements.

      2 votes
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        1 comment  ·  Flag idea as inappropriate…  ·  Admin →
      • Implement SetSubMatrix(int[] rowIndices, int[] columnIndices, Matrix<T> subMatrix)

        Implement method:

        Matrix<T>.SetSubMatrix(int[] rowIndices, int[] columnIndices, Matrix<T> subMatrix)

        where

        int[] rowIndices
        The row indices to copy to.

        int[] columnIndices
        The column indices to copy to.

        Matrix<T> subMatrix
        The sub-matrix to copy from.

        This would enable us to set a larger number of entries at the same time.

        1 vote
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          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
        • To match and provide formulas for statistical and engineering capabilities as in Excel...

          Can provide the calculation abilities of what excel inbuilt formula does as a part of framework This include formula related to statistical and engineering capabilities.

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            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
          • 1 vote
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              0 comments  ·  Flag idea as inappropriate…  ·  Admin →
            • 1 vote
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                planned  ·  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
              • Collection.product

                /// <summary>
                /// Returns the cartesian product of the two collections <c>c1</c>
                /// and <c>c2</c>.
                /// </summary>
                /// <param name="c1">Should not be null.</param>
                /// <param name="c2">Should not be null.</param>
                public static ICollection Product(ICollection c1, ICollection c2)
                {
                if(c1 == null)
                {
                throw new ArgumentNullException("c1", string.Format(Resources.ArgumentNull, "c1"));
                }

                if(c2 == null)
                {
                throw new ArgumentNullException("c2", string.Format(Resources.ArgumentNull, "c2"));
                }

                return null;
                }

                1 vote
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                  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                • estimate

                  I love the Estimate function on some of the distributions in the statistical namespace. Chould we try to expand it to be included in IDistribution or IContinuousDistribution and all distributions. I have the code for some more.

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                    planned  ·  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                  • support infinite precision

                    I really love the infinite precision feature of Google's Android Calculator. If you enter a number like π, e, φ, √2, √3, √5, etc., you can scroll to the right to get an infinite number of digits.

                    Such calculations should be supported by Math.NET Numerics, where results can get queried to get more (decimal) digits. Something like an IEnumerable<DecimalDigit> interface.

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                      0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                    • 1 vote
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                        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                      • Add full multigrid solver (FMG) for boundary value problems, e.g. the Poisson equation.

                        Many simluation and some image processing tasks require solving differential equations, such as heat equation and linear elliptic equation (Poisson equation).

                        In case of 2D data (images), these become partial differential equations (PDEs).

                        These can be solved in linear time using multigrid preconditioner with some relaxation scheme (Gauss-Seidel, CG, biCG).

                        Some reference, including source code, can be found in Press et al.: "Numerical Recipes, 3rd edition".

                        1 vote
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                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                        • Add trigonometrical functions for degrees

                          For most cases it can be overcome with multiplying pi/180 and using loops, but it would make code simpler. Coming from Octave/Matlab it is something I am used to have

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                            3 comments  ·  Flag idea as inappropriate…  ·  Admin →
                          • Levinson Decomposition

                            Levinnson Decomposition (both symmetric and non symmetric) was available in dnAnalytics 0.2 and are highly popular in signal processing. (via alibeirami)

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                              0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                            • Add Matrix indexing using int arrays for row and columns indices to give sub matrix

                              Allow the following A[row, cols] where each of rows and cols are int arrays.

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                                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                              • Matrix multiply-add, like DGEMM

                                BLAS has something like DGEMM which does X = a*A*B + b*X in one loop. This can be very fast, so allowing direct use of this would be handy.

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                                  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                • Histogram should allow custom bucket definition

                                  The existing constructors of the Histogram function allow for a defined number of buckets or a defined number of buckets with a lower and upper bound. It is also useful to specifically define the buckets. For example, I need to do a histogram of a double[] array in increments of 0.5.

                                  1 vote
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                                    0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Add the "Periodic" to "SplineBoundaryCondition" on MathNet.Numerics.Interpolation

                                    Currently, the condition Natural/ParaboricallyTerminated/FirstDerivative/SecondDerivative are on "SplineBoundaryCondition", but I'd like to add Periodic on it(I guess this is equivalent to "csape" on MATLAB).

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                                      0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Geometric Problems - Like Adjacent Points

                                      Where's the namespace for geometric problems?

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                                      • Vector Autoregression

                                        I am a finance professional who is currently using python to run vector autogression. I would prefer to implement in a .NET stack.

                                        The python library is called statstools and there is a similar package in R called VAR.

                                        https://github.com/statsmodels/statsmodels/blob/master/docs/source/vector_ar.rst#id5

                                        I am happy to get involved in adding this feature but may need support.

                                        1 vote
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                                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                        • 0 votes
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