The Nyström method is an efficient technique for the eigenvalue decomposition of large kernel matrices. However, to ensure an accurate approximation, a sufficient number of columns have to be sampled.

🚀 The feature, motivation and pitch Hi, I am trying to implement some code involving sub-matrix (selected by rows or columns) multiplication. A simplified example: m, k, n = 5, 4, 6 A = torch.randn ...

Ahmed Elzanaty received the B.Sc. (with honors) and M.Sc. degrees in Electronics and Communications Engineering from Port Said University, Egypt, in 2008 and 2013, respectively, and the Ph.D. degree ...

A block-structured model for the reconstruction of directed and weighted financial networks spanning multiple countries is developed. In a first step, link probability matrixes are derived via a ...

Algorithm to find a nonsingular submatrix of A. Contribute to GabrielPonte/nsub development by creating an account on GitHub.

Note that 4 submatrices appear inside the new stoichiometric matrix: The upper left submatrix is equivalent to the original stoichiometric matrix, the upper right submatrix has only zeros, the lower ...

The non-singularity condition for this matrix is that at least one positive row sum exists in any principal submatrix of the matrix. The second is for the Z-matrix which satisfies where .

A real square matrix whose non-diagonal elements are non-positive is called a Z-matrix. This paper shows a necessary and sufficient condition for non-singularity of two types of Z-matrices. The first ...