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[CyberAngel]

(09-18-2018 10:15 PM)ammonteir Wrote:  I usually use the HOME view instead of CAS view because of the RPN. But I found a wrong answer in the HOME view for a 2x2 inverse matrix and couldn't figure out why, maybe it's a bug. The matrix is:

|-270510 510|
|510 -2710|

inverse matrix at HOME: (That's a wrong answer)

|-3.69803308307E-6 0|
|0 -3.69134660258E-4|

inverse matrix at CAS: (That's a correct answer)

|-3,69803308307E-6 -6.95939805301E-7|
|-6.95939805301E-7 -3.69134660258E-4|

This difference lead me to a wrong answer in a Electric Circuit analysis.

The correct exact answer using CAS inv is

| -271 -17 |
|------------- ------------|
|73282200 24427400|

| -17 -9017 |
|------------- ------------|
|24427400 24427400|

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