Switched branch and now it works. No error and the solution is correct. I 
guess i not that more inefficient since the times when the rhs is zero is not 
that often, otherwise you wouldn't solve the system that way.

I'm stupid: somehow I was in master and didn't notice that. Sorry for the 
confusion.

On Monday 10 November 2014 09.26:45 you wrote:
> It does not look like you are in fact using the branch with this fix.  The
> branch code looks like:
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ADR;TYPE=work:;;Rämistrasse 101;Zurich;Zurich;8092 Zürich;Switzerland
EMAIL:[email protected]
FN:Filippo Leonardi
N:Leonardi;Filippo;;;
ORG:ETHZ;D-MATH
TEL;TYPE=WORK:(+41) 44 633 9379
UID:a15238e7-9e99-416c-a858-c89834b2b81f
VERSION:3.0
X-KADDRESSBOOK-X-Office:HG J 45
END:VCARD

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