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## LU Factorization: A = P'*L*U ?

**From**: |
Vivek Shanmuganathan \(95410006-BS\) |

**Subject**: |
LU Factorization: A = P'*L*U ? |

**Date**: |
Mon, 17 Jan 2000 12:32:16 +0530 (IST) |

Hello:
What is the Octave definition of LU-Factorisation of a
matrix A? As I understand from LAPACK documentation, the
factorisation is defined as
A = P*L*U ...... (1)
where U is upper diagonal, L is unit lower diagonal, and P
is the permutation matrix (unit matrix with rows
interchanged suitably to satisfy equation (1)).
However, the value of the permutation matrix retuned by
Octave 2.0.14 (i386-redhat-linux-gnu) is actually
transpose(P) as given in (1).
Any comments?
Vivek...
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**Fmins**, *Richard Davis*, `2000/01/12`
**LU Factorization: A = P'*L*U ?**,
*Vivek Shanmuganathan \(95410006-BS\)* **<=**