Single-entry matrix
In mathematics a single-entry matrix is a matrix where a single matrix and the rest of the elements are zero,[1][2] e.g.,
It is a specific type of a sparse matrix. The single-entry matrix can be regarded a row-selector when it is multiplied on the left side of the matrix, e.g.:
Alternatively, a column-selector when multiplied on the right side:
The name, single-entry matrix, is not common, but seen in a few works.[3]
References
- ↑ Kaare Brandt Petersen & Michael Syskind Pedersen (2008-02-16). "The Matrix Cookbook".
- ↑ Shohei Shimizu, Patrick O. Hoyer, Aapo Hyvärinen & Antti Kerminen (2006). "A Linear Non-Gaussian Acyclic Model for Causal Discovery". Journal of Machine Learning Research 7: 2003–2030.
- ↑ Examples: