Imaginary Matrix Division

[J-F Garnier]

(08-21-2021 06:17 AM)Joe Horn Wrote:  

(08-21-2021 02:57 AM)toml_12953 Wrote:  The Prime does this:
[[1 1][1 1]] / [[1 1][1 i]]
[[1 1][0 0]]
Most other calculators get [[1 0][1 0]] for an answer. Which is right?

The 50g also gets [[1 1][0 0]].
Wolfram Alpha returns [[1 1][1 -i]]. Hmmm.

Same result, as early as the 28S, and even the HP-71B w/ Math ROM (doing INV(B)*A ).

(08-21-2021 06:43 AM)Tonig00 Wrote:  When ask Prime a/b gives a warning: inv(b)*a
This gives [[1 1][0 0]]
If you do a*inv(b) gives [[1 0][1 0]]
For me exponents should be operate first so prime in this misleading expresión is correct. But I am not sure, could be the opposite.

RPL machines (since the 28S) were implementing the "matrix division" a/b as inv(b)*a.

J-F