SUM(X,D)

[Alois SCHLOEGL]

Matlab allows a second parameter in SUM(X,D)
That would be nice in Octave, too.

 SUM Sum of elements.
    For vectors, SUM(X) is the sum of the elements of X. For
    matrices, SUM(X) is a row vector with the sum over each
    column. For N-D arrays, SUM(X) operates along the first
    non-singleton dimension.

    SUM(X,DIM) sums along the dimension DIM.

    Example: If X = [0 1 2
                     3 4 5]

    then sum(X,1) is [3 5 7] and sum(X,2) is [ 3
                                              12];

Regards,
      Alois

P.S.: find more matlab related stuff at
http://www-dpmi.tu-graz.ac.at/~schloegl/matlab/