Re: [eigen] [patch] LDLt decomposition with rank-deficient matrices |

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*To*: "eigen@xxxxxxxxxxxxxxxxxxx" <eigen@xxxxxxxxxxxxxxxxxxx>*Subject*: Re: [eigen] [patch] LDLt decomposition with rank-deficient matrices*From*: Jitse Niesen <jitse@xxxxxxxxxxxxxxxxx>*Date*: Wed, 24 Feb 2010 10:53:57 +0000 (GMT)

On Wed, 24 Feb 2010, Gael Guennebaud wrote:

note that the LDLT decomp does pivoting, so it is normal that you don'tget the same diagonal matrix. If you reconstruct the matrix from thedecomp you will see that in this case the decomp is correct.

A = [ 0 0; 0 1 ] (these are 2-by-2 matrices in Matlab notation) L = [ 0 0; sqrt(3) 1 ] D = [ 1/4 0; 0 1/4 ]

Cheers, Jitse

**Follow-Ups**:**Re: [eigen] [patch] LDLt decomposition with rank-deficient matrices***From:*Benoit Jacob

**Re: [eigen] [patch] LDLt decomposition with rank-deficient matrices***From:*Ben Goodrich

**References**:**[eigen] [patch] LDLt decomposition with rank-deficient matrices***From:*Ben Goodrich

**Re: [eigen] [patch] LDLt decomposition with rank-deficient matrices***From:*Benoit Jacob

**Re: [eigen] [patch] LDLt decomposition with rank-deficient matrices***From:*Ben Goodrich

**Re: [eigen] [patch] LDLt decomposition with rank-deficient matrices***From:*Benoit Jacob

**Re: [eigen] [patch] LDLt decomposition with rank-deficient matrices***From:*Ben Goodrich

**Re: [eigen] [patch] LDLt decomposition with rank-deficient matrices***From:*Gael Guennebaud

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