Raul Miller wrote:

> I am having a problem understanding why
>   (1&o.D.1 D.1 -: 1&o.D.2) (_78 0.9 1p1 1j1)
> 0

I agree there is a problem.  I do not know if the algorithm is flawed, or
if it is just an inaccurate approximation (as has been noted before). 
Here is a very simple example.

   f=:*:"1
   f D. 1 D. 1 (1 2)
2 0
0 0

0 0
0 2
   f D. 2 (1 2)
  1.9984        0
       0 _1.11022

0.488498        0
       0   1.9984

Best wishes,

John


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