Editing Matrix decomposition (section)

== Generalizations ==
{{Expand section|1=examples and additional citations|date=December 2014}}
There exist analogues of the SVD, QR, LU and Cholesky factorizations for '''quasimatrices''' and '''cmatrices''' or '''continuous matrices'''.<ref>{{harvnb|Townsend|Trefethen|2015}}</ref> A ‘quasimatrix’ is, like a matrix, a rectangular scheme whose elements are indexed, but one discrete index is replaced by a continuous index. Likewise, a ‘cmatrix’, is continuous in both indices. As an example of a cmatrix, one can think of the kernel of an [[integral operator]].

These factorizations are based on early work by {{harvtxt|Fredholm|1903}}, {{harvtxt|Hilbert|1904}} and {{harvtxt|Schmidt|1907}}. For an account, and a translation to English of the seminal papers, see {{harvtxt|Stewart|2011}}.