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

10232019, 07:01 AM
Post: #25




RE: Unexpected result calculating the determinant of a singular matrix (42S)
(10232019 04:50 AM)Valentin Albillo Wrote: But try instead with AM#7, a matrix of the same dimensions (7x7) and similarlysized integer elements, as detailed in my article Still works.. This time the condition number is about 7e12, and the determinant can be expected to be correct to about 2 digits: .998918882 with F54 Set. With F54 Clear, it's 1 exactly, of course. A 7x7 matrix with integer elements less than 100 and determinant 1 will always have at least 1 digit correct when the calculations are done with 15 digits, and so the rounding will work. Now, Valentin, I have always wondered how you created these matrices, and I've asked you once before (a very long time ago, admittedly). Can you shed some light on this? Cheers, Werner 

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