a # 1 60 R ' r#a rcat b                                                 '
a # a,[1]  '"row catenation,scalar replication                          '
a # a,[1]  ' cformat                                                    '
a # a,[1]  ' cmatrix                                                    '
a # a,[1]  ' colform                                                    '
a # a,[1]  ' C''r#vert a,'',((0^=(RRa)+RRb)/''[Lio]''),''b''                  '
a # a,[1]  ' $0                                                         '
a # a,[1]  '"rcat - catenate by rows.                                   '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm. '
a # a,[1]  '"-over-under catenation of general structures and types.    '
a # a,[1]  '"-scalars will be replicated.                               '
a # a,[1]  '"-padding will be blank for characters, zero for numbers.   '
a # a,[1]  '"-numeric types will be formatted if to be catenated to     '
a # a,[1]  '"-character types. see: Gon Gccat                           '
a # a,[1]  '"-a matrix is returned.                                     '
a # a,[1]  '"uses: Gcformat Cmatrix Gcolform Gvert                      '
Lfx a