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

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Follow-up Comment #23, bug #48564 (group octave):


> Among the many things I find odd here is why scalars aren't treated
> uniformly.  If one of the operands, B or A, is a scalar why doesn't that just
> switch the operation to element-by-element?

I think that behavior is ok, and actually preferred.  There's an ambigiuity
with the scalar case and a 1 column/row vector with mrdivide and mldivide.   

x = B/A solves the system of linear equations x*A = B for x

x = 14/[1;2;3] corresponds to x*[1;2;3] = 14 which solves to x = [1 2 3].  if
it went to elementwise math right away, you'd get x=[14;7;4.67].  

since the primary purpose of the operator is the matrix solution, it should
only fall back on elementwise math when there isn't a valid matrix math
definition.




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