# Non-Square Matrix

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A Non-Square Matrix is a matrix in which the matrix horizontal length, $m$, and matrix vertical length, $n$ are not the same ($m \ne n$).

## References

### 2015

• (Wikipedia, 2015) ⇒ http://en.wikipedia.org/wiki/invertible_matrix Retrieved:2015-12-5.
• … Non-square matrices (m-by-n matrices for which m ≠ n) do not have an inverse. However, in some cases such a matrix may have a left inverse or right inverse. If A is m-by-n and the rank of A is equal to n, then A has a left inverse: an n-by-m matrix B such that BA = I. If A has rank m, then it has a right inverse: an n-by-m matrix B such that AB = I.