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For questions about using and representing matrices on a computer in order to solve computational problems. Should generally also include a tag about the specific property/problem you are solving (e.g. [tag:linear-algebra], [tag:eigenvalues], [tag:inverse].
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Unimodular Matrix calculation
I know for a given matrix $M$, there exists a matrix $U$ over the integers with determinant $+1$ or $-1$
such that $UM=E$. I know $E$, but $M$ is not a square matrix. …