Unexpected result calculating the determinant of a singular matrix (42S)

[Valentin Albillo]

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Hi, Werner:

(10-22-2019 06:12 AM)Werner Wrote:  ? of course the cheat works. With Flag -54 clear, the 48GX returns 1 exactly, with Flag -54 set it returns .999945522778.

Well, I don't own any breed of HP48 so I couldn't check it myself but the only reason it works here is because AM#1 is way too nice and the calc returns a determinant, 0.9999455..., which is close enough to 1 to make the cheat work.

But try instead with AM#7, a matrix of the same dimensions (7x7) and similarly-sized integer elements, as detailed in my article

Mean Matrices, under "Can it get any worse ?"

and see how the 48 fares, with or without cheat. Can't check it myself but I very much doubt it will deliver the goods this time.

Regards.
V.