Vector operation missing (?) vecmult()

The semantic is “concatenate n copies of the given vector (or rows of
a matrix).  An extra argument (default 1) for multiplicity of
concatenation of columns-in-a-matrix.

  It is unclear which direction of catenation is better by default for
  matrices!  (I needed this only for vectors so far…)

Did I miss it?  (Cannot find via “???”…)

Thanks,
Ilya