[vtkusers] LUFactorLinearSystem - How to get L and U?

[John Platt]

Hi David,

Just a quick guess that L is a unit lower triangular matrix and therefore 
the diagonal is not stored.

John.


----- Original Message ----- 
From: "David Doria" <daviddoria at gmail.com>
To: <vtkusers at vtk.org>
Sent: Tuesday, June 25, 2013 9:38 PM
Subject: [vtkusers] LUFactorLinearSystem - How to get L and U?


> Here is a little example that tries to factor the matrix
> [4 3]
> [6 3]
>
> http://www.vtk.org/Wiki/VTK/Examples/Broken/LUFactorization
>
> The documentation says "Output factorization LU is in matrix A" (it is
> written over the matrix that is passed in). I don't understand this
> though - the matrix is 2x2, and there are 3 non-zero entries of each
> of L and U (for a total of 6). Can anyone explain how to get L and U?
>
> Thanks,
>
> David
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