max (matrix, DIM) does not behave as advertised

[Francesco Potortì]

The help string says:

 -- Mapping Function:  max (X, Y, DIM)

     For a matrix
     argument, return the maximum value from each column, as a row
     vector, or over the dimension DIM if defined.

but:

octave3.1> max(ones(2),2)
ans =

   2   2
   2   2

moreover:

octave3.1> max(ones(2),ones(2),2)
ans =

   1   1
   1   1

while it should probably give an error.

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