Hey,

 >> Yeah. I thought that, since I'd fixed the segfault and the expression
>> tree worked for other expressions, the problem didn't lie in the
>> wrapper. But I began to doubt that judgement, so I wrote a C++ test
>> program[1] to do the equivalent construction manually. And that
>> worked.. So the mystery deepens; I shall return to it tomorrow..
>
> Actually, I solved it -- I was implicitly calculating the size of the
> result matrix incorrectly... Thank goodness for tests, eh?

I'm glad it's working now :-)

The importance of tests cannot be underestimated. Whenever some 
fundamental changes to the core happen, it's just great to have a
   make test
available and have that check for the many corner cases...

Best regards,
Karli


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