MPQ = 'U', the leading N-by-N-by-K part
          of this array must contain the initial orthogonal factors
          as described in (1) and (2).
          On entry, if COMPQ = 'P', only parts of the leading
          N-by-N-by-K part of this array must contain some
          orthogonal factors as described by the parameters QIND.
          If COMPQ = 'I', this array should not be set on entry.
          On exit, if COMPQ = 'U' or COMPQ = 'I', the leading
          N-by-N-by-K part of this array contains t