Re: [eigen] Re: SparseQR crashes on rectangular matrix |

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*To*: "eigen@xxxxxxxxxxxxxxxxxxx" <eigen@xxxxxxxxxxxxxxxxxxx>*Subject*: Re: [eigen] Re: SparseQR crashes on rectangular matrix*From*: Pavel Holoborodko <pavel@xxxxxxxxxxxxxxx>*Date*: Thu, 12 Sep 2013 01:10:06 +0900

QR is useful for analysis and solution of underdetermined systems too.

Here is chapter from Higham's book: http://epubs.siam..org/doi/abs/10.1137/1.9780898718027.ch21

Same approach referenced in Golub & Loan (ch. 5.7.2).

Will test m == n again and will let you know the details tomorrow (now is pretty late in Tokyo).

Btw, Intel compiler bounds checker detects many out-bounds reads & writes in SparseQR even for m > n.

Whereas no such issues are detected for sparse LU & LDLt.

It is again ICC 13.1 & MSVC combo.

**Follow-Ups**:**Re: [eigen] Re: SparseQR crashes on rectangular matrix***From:*Pavel Holoborodko

**References**:**[eigen] SparseQR crashes on rectangular matrix***From:*Pavel Holoborodko

**[eigen] Re: SparseQR crashes on rectangular matrix***From:*Pavel Holoborodko

**Re: [eigen] Re: SparseQR crashes on rectangular matrix***From:*Gael Guennebaud

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