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

10212019, 11:58 AM
Post: #10




RE: Unexpected result calculating the determinant of a singular matrix (42S)
The HP 50 in approximate mode and with flag 54 (the "cheat" flag) set*, returns 0 for both Dave's and Thomas's matrices. I'm surprised that the 42s gives an inexact result, I assumed the internal code for matrix math was essentially the same as the 48/49 series.
* Note that setting the flag removes the "cheat". Also, according to the HP 50 AUR, the basis for setting tiny elements to 0 is that intermediate results are less than 1E14. It does not say anything about integer values. 

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