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

10232019, 04:50 AM
(This post was last modified: 10232019 04:51 AM by Valentin Albillo.)
Post: #24




RE: Unexpected result calculating the determinant of a singular matrix (42S)
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Hi, Werner: (10222019 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 similarlysized 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. All My Articles & other Materials here: Valentin Albillo's HP Collection 

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