a # 1 60 R 'z # matrix a                                                '
a # a,[1]  '"matrix - forces the result to two dimensions.              '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm. '
a # a,[1]  'z#((X/-1Uz),-1Yz#1 1,Ra)Ra                                  '
Lfx a