[bug #48564] mrdivide and mldivide do not compatibly handle divisor ndim>2

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Update of bug #48564 (group octave):

                 Summary: Octave does not accept "1 / ND array", "mrdivide (1,
ND array)", "mldivide (ND array, 1)" => mrdivide and mldivide do not
compatibly handle divisor ndim>2

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Follow-up Comment #18:

long story long:  

for mldivide(A,B) = A\B and mrdivide(B,A)=B/A:

documented: 
- if A is scalar, always do elementwise operation. 
- if A is 2D, attempt to solve Ax=B or xA=B, respectively, and give a
nonconformance error if A and B are not sized correctly for that.

undocumented: 
- if ndims(A)>2, always do elementwise operation 

i'm not seeing any special cases for A or B = 1 or for square A or B.

it's been a decade, so don't know if matlab documentation has changed since
then.  but current octave behavior appears to just be missing the (currently)
undocumented ndim>2 case.

updating report name.  do we just change category to Undocumented Matlab?


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