Math.NET Numerics

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  1. Fix a dimensionality bug in the SparseMatrix solve method

    I am using the solve method on a DenseMatrix and two vectors. When I try to use the same method but with a SparseMatrix, I get a dimensionality error saying that all vectors must be the same dimensions.

    I believe the method asserts that the input vector is of the same length as the matrix's number of columns, and probably should check against the matrix's number of rows.

    2 votes
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      0 comments  ·  Flag idea as inappropriate…  ·  Admin →
    • Implement the Gumbel ContinuousDistribution

      Implement the Gumbel ContinuousDistribution

      2 votes
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        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
      • Provide extremal values for interpolated splines

        Provide extremal points and values and thus also min/max for interpolated splines.

        2 votes
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          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
        • Add interchange/swap function to Matrix class

          Add interchange/swap function to Matrix class which would allow swapping two rows or columns in the matrix (i.e. m.swapRows(2,3)).

          2 votes
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            under review  ·  1 comment  ·  Flag idea as inappropriate…  ·  Admin →
          • Histogram constructor with buckets. Data is applied to the buckets.

            I need to create a histogram with buckets from another histogram and expect my data to be counted relative to those buckets.

            2 votes
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              under review  ·  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

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

                  Where's the namespace for geometric problems?

                  2 votes
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                    0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                  • Improving sparse matrix storage CRS by allowing the user to provide the sparsity structure of the matrix.

                    I'm new to math.net, but I've found some issues with the libraries.

                    One of these is related to sparsematrix and sparsecompressedrowstorage

                    I've also wrote a post within the discussion forum, but I've recieved no response.

                    The problem is simple: I've tried desperately to find a way to assign directly the sparse matrix in CRS format, but I've failed.
                    It seems that the CSR must be constructed starting from an already existing matrix. This would imply a big performace issue and memory allocation problems.
                    For istance, if one want to write a program to solve some physical problem with finite element…

                    1 vote
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                      0 comments  ·  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 →
                      • Fix splines so that they can handle general lines

                        When adding the points of a circle ( Cos(t), sin(t) ) for t the values [0,6.28], I get complete garbage out.
                        It seems that the splines are unable to handle ambiguous values for y for a given x.
                        Splines should have a independent variable t, on which x and y depend. It seems this implementation has a t that somehow is coupled to x.
                        Interpolate should for example return a point, and the differentiate should return a vector for a given point.

                        1 vote
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                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                        • 1 vote
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                            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                          • Dense and sparse matrix slicing based on input user defined indices

                            This should allow functionality similar to MATLAB:
                            Suppose that A is the following matrix

                            A = [ 10 20 30 40 ;
                            11 21 31 41;
                            12 22 32 42;
                            13 23 33 43]

                            and I = { 1, 2, 4 } and J = { 3, 4 }

                            A_IJ = A[I, J]

                            should return a slice of the matrix according to the indices specified:
                            A_IJ = [ 30 40;
                            31 41;
                            33 43 ]

                            The same idea is very useful for arrays and it should work in both directions, for example:

                            A[I, J] += some_3by2_matrix;

                            The same for sparse…

                            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.

                              1 vote
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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 →
                                  • 1 vote
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                                      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.

                                        1 vote
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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.

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