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

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QR is useful for analysis and solution of underdetermined systems too. 
Here is chapter from Higham's book:
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. 

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