a # 1 60 R 'z # a addcols b                                             '
a # a,[1]  '"addcols - add columns to a matrix vector or scalar.        '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm. '
a # a,[1]  '">converts scalar and vector right arguments into one-row   '
a # a,[1]  '" matrices and pads them out on the left (positive left     '
a # a,[1]  '" argument) or on the right (negative left argument). right '
a # a,[1]  '" argument may be either numeric or character.              '
a # a,[1]  '">uses: matrix.                                             '
a # a,[1]  'z#((1YRb),_a+(Xa)X1URb)Yb#matrix b                          '
Lfx a