I have figured out what was going wrong: after #17272, the *generic* 
algorithm was being called rather than the specific implementation, which 
was still called _echelon_in_place_classical. I have added a 
_echelon_in_place to the meataxe matrices to simply call this. We probably 
should have design discussion about how to best work the code for 
potentially different algorithms for different matrix implementations. At 
least, it seems to be the current framework is not so sustainable as-is.

Best,
Travis


On Thursday, May 31, 2018 at 7:28:44 PM UTC+10, Simon King wrote:
>
> Hi Vincent, 
>
> On 2018-05-31, Vincent Delecroix <20100.d...@gmail.com <javascript:>> 
> wrote: 
> > I have no idea which ticket introduced this change but it used to work 
> > fine on beta2. 
>
> Travis said it might be #17272. Anyway, I am at it, and hope to fix the 
> problem in the next few days. 
>
> Best regards, 
> Simon 
>
>

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