a # 1 61 R ' r#qv dl v                                                   '
a # a,[1]  ' r#(~&\vEqv)/v                                               '
a # a,[1]  '"dl - used in e.g. conv.                                     '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm.  '
a # a,[1]  '"will delete leading elements from a vector. qv is a quoted  '
a # a,[1]  '"character string or a numeric vector that contains examples '
a # a,[1]  '"to be deleted.                                              '
Lfx a