simple vector to matrix transformation

[Jim Van Zandt]

I just needed to add the same vector to every column of a matrix.
Since octave does not automatically promote a vector to a matrix, I
did this:

a =

  0.095555
  0.789421
  0.122409

octave:12> b=diag(a)*ones(3,4)
b =

  0.095555  0.095555  0.095555  0.095555
  0.789421  0.789421  0.789421  0.789421
  0.122409  0.122409  0.122409  0.122409


I could then add b to the original matrix.

Of course, the multiplication is inefficient.  I seem to remember
there was a more direct way to do this transformation, but I can't
find it in the docs.  Is there?

                        - Jim Van Zandt



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