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

10252019, 11:00 PM
Post: #28




RE: Unexpected result calculating the determinant of a singular matrix (42S)
(10242019 06:34 AM)Werner Wrote:(10232019 11:06 PM)Valentin Albillo Wrote: I can't try and find a counterexample to what you state because I don't have an HP48whatever to check if my attempts work or not so I'll take your word for it. Not necessarily. For a 7x7 matrix with 2digit integer elements each individual intermediate product would be no longer than 7x2 = 14 digits, that's correct, but to compute the determinant you're adding up many such products and thus the result can wildly exceed 14 digits, so if you're using just 15 digits for the intermediate terms and final result you're likely to lose them all and then some. Regards and have a nice weekend. V. All My Articles & other Materials here: Valentin Albillo's HP Collection 

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