..
     .. Array Arguments ..
     ..
  Purpose
  =======
  PZLARZT forms the triangular factor T of a complex block reflector
  H of order > n, which is defined as a product of k elementary
  reflectors as returned by PZTZRZF.
  If DIRECT = 'F', H = H(1) H(2) . . . H(k) and T is upper triangular;
  If DIRECT = 'B', H = H(k) . . . H(2) H(1) and T is lower triangular.
  If STOREV = 'C', the vector which defines the elementary reflector
  H(i) is stored in the i-th column of the array V, and
     H  =  I - V * T * V'
  If STOREV = 'R', the vector which defines the elementary reflector
  H(i) is stored in the i-th row of the array V, and
     H  =  I - V' * T * V
  Currently, only STOREV = 'R' and DIRECT = 'B' are supported.
  Notes
  =====
  Each global data object is described by an associated description
  vector.  This vector stores the information required to establish
  the mapping between an object element and its corresponding process
  and memory location.
  Let A be a generic term for any 2D block cyclicly distributed array.
  Such a global array has an associated description vector DESCA.
  In the following comments, the character _ should be read as
  "of the global array".
  NOTATION        STORED IN      EXPLANATION
  --------------- -------------- --------------------------------------
  DTYPE_A(global) DESCA( DTYPE_ )The descriptor type.  In this case,
                                 DTYPE_A = 1.
  CTXT_A (global) DESCA( CTXT_ ) The BLACS context handle, indicating
                                 the BLACS process grid A is distribu-
                                 ted over. The context itself is glo-
                                 bal, but the handle (the integer
                                 value) may vary.
  M_A    (global) DESCA( M_ )    The number of rows in the global
                                 array A.
  N_A    (global) DESCA( N_ )    The number of columns in the global
                                 array A.
  MB_A   (global) DESCA( MB_ )   The blocking factor used to distribute
                                 the rows of the array.
  NB_A   (global) DESCA( NB_ )   The blocking factor used to distribute
                                 the columns of the array.
  RSRC_A (global) DESCA( RSRC_ ) The process row over which the first
                                 row of the array A is distributed.
  CSRC_A (global) DESCA( CSRC_ ) The process column over which the
                                 first column of the array A is
                                 distributed.
  LLD_A  (local)  DESCA( LLD_ )  The leading dimension of the local
                                 array.  LLD_A >= MAX(1,LOCr(M_A)).
  Let K be the number of rows or columns of a distributed matrix,
  and assume that its process grid has dimension p x q.
  LOCr( K ) denotes the number of elements of K that a process
  would receive if K were distributed over the p processes of its
  process column.
  Similarly, LOCc( K ) denotes the number of elements of K that a
  process would receive if K were distributed over the q processes of
  its process row.
  The values of LOCr() and LOCc() may be determined via a call to the
  ScaLAPACK tool function, NUMROC:
          LOCr( M ) = NUMROC( M, MB_A, MYROW, RSRC_A, NPROW ),
          LOCc( N ) = NUMROC( N, NB_A, MYCOL, CSRC_A, NPCOL ).
  An upper bound for these quantities may be computed by:
          LOCr( M ) <= ceil( ceil(M/MB_A)/NPROW )*MB_A
          LOCc( N ) <= ceil( ceil(N/NB_A)/NPCOL )*NB_A
  Arguments
  =========
  DIRECT  (global input) CHARACTER
          Specifies the order in which the elementary reflectors are
          multiplied to form the block reflector:
          = 'F': H = H(1) H(2) . . . H(k) (Forward, not supported yet)
          = 'B': H = H(k) . . . H(2) H(1) (Backward)
  STOREV  (global input) CHARACTER
          Specifies how the vectors which define the elementary
          reflectors are stored (see also Further Details):
          = 'C': columnwise                        (not supported yet)
          = 'R': rowwise
  N       (global input) INTEGER
          The number of meaningful entries of the block reflector H.
          N >= 0.
  K       (global input) INTEGER
          The order of the triangular factor T (= the number of
          elementary reflectors). 1 <= K <= MB_V (= NB_V).
  V       (input/output) COMPLEX*16 pointer into the local memory
          to an array of local dimension (LOCr(IV+K-1),LOCc(JV+N-1)).
          The distributed matrix V contains the Householder vectors.
          See further details.
  IV      (global input) INTEGER
          The row index in the global array V indicating the first
          row of sub( V ).
  JV      (global input) INTEGER
          The column index in the global array V indicating the
          first column of sub( V ).
  DESCV   (global and local input) INTEGER array of dimension DLEN_.
          The array descriptor for the distributed matrix V.
  TAU     (local input) COMPLEX*16, array, dimension LOCr(IV+K-1)
          if INCV = M_V, and LOCc(JV+K-1) otherwise. This array
          contains the Householder scalars related to the Householder
          vectors.  TAU is tied to the distributed matrix V.
  T       (local output) COMPLEX*16 array, dimension (MB_V,MB_V)
          It contains the k-by-k triangular factor of the block
          reflector associated with V. T is lower triangular.
  WORK    (local workspace) COMPLEX*16 array,
                                           dimension (K*(K-1)/2)
  Further Details
  ===============
  The shape of the matrix V and the storage of the vectors which define
  the H(i) is best illustrated by the following example with n = 5 and
  k = 3. The elements equal to 1 are not stored; the corresponding
  array elements are modified but restored on exit. The rest of the
  array is not used.
  DIRECT = 'F' and STOREV = 'C':         DIRECT = 'F' and STOREV = 'R':
                                              ______V_____
         ( v1 v2 v3 )                        /            \
         ( v1 v2 v3 )                      ( v1 v1 v1 v1 v1 . . . . 1 )
     V = ( v1 v2 v3 )                      ( v2 v2 v2 v2 v2 . . . 1   )
         ( v1 v2 v3 )                      ( v3 v3 v3 v3 v3 . . 1     )
         ( v1 v2 v3 )
            .  .  .
            .  .  .
            1  .  .
               1  .
                  1
  DIRECT = 'B' and STOREV = 'C':         DIRECT = 'B' and STOREV = 'R':
                                                        ______V_____
            1                                          /            \
            .  1                           ( 1 . . . . v1 v1 v1 v1 v1 )
            .  .  1                        ( . 1 . . . v2 v2 v2 v2 v2 )
            .  .  .                        ( . . 1 . . v3 v3 v3 v3 v3 )
            .  .  .
         ( v1 v2 v3 )
         ( v1 v2 v3 )
     V = ( v1 v2 v3 )
         ( v1 v2 v3 )
         ( v1 v2 v3 )
  =====================================================================
     .. Parameters ..