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<div>An '''irregular matrix''', or '''ragged matrix''', can be described as a [[matrix (mathematics)|matrix]] that has a different number of elements in each row. Ragged matrices are not used in [[linear algebra]], since standard matrix transformations cannot be performed on them, but they are useful as [[array data structure|array]]s in [[computing]]. Irregular matrices are typically stored using [[Iliffe vector]]s.<br />
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For example, the following is an irregular matrix:<br />
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:<math><br />
\begin{bmatrix}<br />
1 & 31 & 12& -3 \\<br />
7 & 2 \\<br />
1 & 2 & 2<br />
\end{bmatrix}<br />
</math><br />
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== See also ==<br />
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* [[Matrix (mathematics)]]<br />
* [[Regular matrix (disambiguation)]]<br />
* [[Sparse matrix]]<br />
* [[Array data structure]]<br />
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==References==<br />
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* Paul E. Black, [http://www.nist.gov/dads/HTML/raggedmatrix.html Ragged matrix], from [[Dictionary of Algorithms and Data Structures]], Paul E. Black, ed., [[National Institute of Standards and Technology|NIST]], 2004.<br />
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[[Category:Arrays]]<br />
[[Category:Matrices]]</div>80.168.236.220