Math.NET Numerics Matrices and Vectors

Matrices and Vectors

https://numerics.mathdotnet.com/Matrix.html

// Copy of an existing matrix (can also be sparse or diagonal)
Matrix<double> x = ...
M.DenseOfMatrix(x);

// Directly bind to an existing column-major array without copying (note: no "Of")
double[] x = existing...
M.Dense(3, 4, x);

// From a 2D-array
double[,] x = {{ 1.0, 2.0 },
               { 3.0, 4.0 }};
M.DenseOfArray(x);

// From an enumerable of values and their coordinates
Tuple<int,int,double>[] x = {Tuple.Create(0,0,2.0), Tuple.Create(0,1,-3.0)};
M.DenseOfIndexed(3,4,x);

// From an enumerable in column major order (column by column)
double[] x = {1.0, 2.0, 3.0, 4.0};
M.DenseOfColumnMajor(2, 2, x);

// From an enumerable of enumerable-columns (optional with explicit size)
IEnumerable<IEnumerable<double>> x = ...
M.DenseOfColumns(x);

// From a params-array of array-columns (or an enumerable of them)
M.DenseOfColumnArrays(new[] {2.0, 3.0}, new[] {4.0, 5.0});

// From a params-array of column vectors (or an enumerable of them)
M.DenseOfColumnVectors(V.Random(3), V.Random(3));

// Equivalent variants also for rows or diagonals:
M.DenseOfRowArrays(new[] {2.0, 3.0}, new[] {4.0, 5.0});
M.DenseOfDiagonalArray(new[] {2.0, 3.0, 4.0});

// if you already have existing matrices and want to concatenate them
Matrix<double>[,] x = ...
M.DenseOfMatrixArray(x);