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HP Prime [ Matrix Function ] BUG ln( [[0,1][1,1]] ) in Exact and Approximate CAS Mode
10-30-2014, 05:55 AM
Post: #1
HP Prime [ Matrix Function ] BUG ln( [[0,1][1,1]] ) in Exact and Approximate CAS Mode
I would like to Report a BUG in HP Prime CAS [ Matrix Functions ], specifically in calculating

ln( [[0,1][1,1]] )

which resulted in a matrix response with WRONG Matrix[1,2] and Matrix[2,1] elements.

I'am using the Newest version ROM 6030 in calculator and 6031 in emulator, and the problem in CAS mode
results both in Exact and Approximate Mode, for which the

[[−0.215204470482+2.2732777998989*i , 0.430408940964]
[0.430408940964+1.40496294621*i , 0.21520447048202+0.868314853691*i]]

approximate numerical result returned simply does not match with the Correct numerical answer which should be

[[−0.215204470482+2.2732777998989*i , 0.430408940964-1.4049629462081*i]
[0.430408940964-1.40496294621*i , 0.21520447048202+0.868314853691*i]]

which in this case returns back approximately [[0.,1.][1.,1.]] by taking e^Correct Result,

and produces a Wrong result by taking e^Wrong Answer ( produced by ln( [[0,1][1,1]] ) in HP Prime ),

which returned a totally distinct matrix ( with all complex numbers ) instead of the [[0.,1.][1.,1.]] expected result.

Yours Sincerely, hoping this Post would be Directed to the Right HP Prime Staff Personnel so as to provide
a future BUG Correction in a next ROM release, wishing a Nice day and work to all.
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HP Prime [ Matrix Function ] BUG ln( [[0,1][1,1]] ) in Exact and Approximate CAS Mode - profrd - 10-30-2014 05:55 AM



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