ⓘ Crout matrix decomposition
In linear algebra, the Crout matrix decomposition is an LU decomposition which decomposes a matrix into a lower triangular matrix, an upper triangular matrix and, although not always needed, a permutation matrix. It was developed by Prescott Durand Crout.
The Crout matrix decomposition algorithm differs slightly from the Doolittle method. Doolittles method returns a unit lower triangular matrix and an upper triangular matrix, while the Crout method returns a lower triangular matrix and a unit upper triangular matrix.
So, if a matrix decomposition of a matrix A is such that:A = LDU
being L a unit lower triangular matrix, D a diagonal matrix and U a unit upper triangular matrix, then Doolittles method producesA = LDU
and Crouts method producesA = LDU.
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