Craig's reply is a good summary of what I was going to say. I'm  
getting an

abort: unknown parent e91367eb18c1!

in trying to look at your patch. It sounds like a very good idea though.

On another note, however, the matrix coercion code has changed  
significantly in the (as-yet unapplied) patch at http:// 
trac.sagemath.org/sage_trac/ticket/624

- Robert


On Oct 4, 2007, at 6:53 AM, William Stein wrote:

> On 10/4/07, Joel B. Mohler <[EMAIL PROTECTED]> wrote:
>>
>> Well, I'll reply to myself on this.  I made a ticket and attached  
>> a patch (to
>> the ticket).  I do want some other people looking at it to see if  
>> there are
>> more elegant fixes.  It does make a quite noticable runtime  
>> difference on 7x7
>> matrices (I was rather amazed how much the difference was actually).
>>
>> http://trac.sagemath.org/sage_trac/ticket/822
>
> Thanks.  I think in general there has been essentially *no* tuning of
> small matrix arithmetic in Sage -- we've always cared about very large
> matrices.  It would be very good to do work toward tuning the small
> cases, like you're doing.  Thanks!
>
> William
>
> 

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