pb_pslaprnt()

subroutine pb_pslaprnt	(	integer	m,
		integer	n,
		real, dimension( * )	a,
		integer	ia,
		integer	ja,
		integer, dimension( * )	desca,
		integer	irprnt,
		integer	icprnt,
		character*(*)	cmatnm,
		integer	nout,
		real, dimension( * )	work
	)

Definition at line 8634 of file psblastst.f.

*
*  -- PBLAS test routine (version 2.0) --
*     University of Tennessee, Knoxville, Oak Ridge National Laboratory,
*     and University of California, Berkeley.
*     April 1, 1998
*
*     .. Scalar Arguments ..
      INTEGER            IA, ICPRNT, IRPRNT, JA, M, N, NOUT
*     ..
*     .. Array Arguments ..
      CHARACTER*(*)      CMATNM
      INTEGER            DESCA( * )
      REAL               A( * ), WORK( * )
*     ..
*
*  Purpose
*  =======
*
*  PB_PSLAPRNT  prints to the standard output a submatrix sub( A ) deno-
*  ting A(IA:IA+M-1,JA:JA+N-1). The local pieces are sent and printed by
*  the process of coordinates (IRPRNT, ICPRNT).
*
*  Notes
*  =====
*
*  A description  vector  is associated with each 2D block-cyclicly dis-
*  tributed matrix.  This  vector  stores  the  information  required to
*  establish the  mapping  between a  matrix entry and its corresponding
*  process and memory location.
*
*  In  the  following  comments,   the character _  should  be  read  as
*  "of  the  distributed  matrix".  Let  A  be a generic term for any 2D
*  block cyclicly distributed matrix.  Its description vector is DESCA:
*
*  NOTATION         STORED IN       EXPLANATION
*  ---------------- --------------- ------------------------------------
*  DTYPE_A (global) DESCA( DTYPE_ ) The descriptor type.
*  CTXT_A  (global) DESCA( CTXT_  ) The BLACS context handle, indicating
*                                   the NPROW x NPCOL BLACS process grid
*                                   A  is distributed over.  The context
*                                   itself  is  global,  but  the handle
*                                   (the integer value) may vary.
*  M_A     (global) DESCA( M_     ) The  number of rows in the distribu-
*                                   ted matrix A, M_A >= 0.
*  N_A     (global) DESCA( N_     ) The number of columns in the distri-
*                                   buted matrix A, N_A >= 0.
*  IMB_A   (global) DESCA( IMB_   ) The number of rows of the upper left
*                                   block of the matrix A, IMB_A > 0.
*  INB_A   (global) DESCA( INB_   ) The  number  of columns of the upper
*                                   left   block   of   the   matrix  A,
*                                   INB_A > 0.
*  MB_A    (global) DESCA( MB_    ) The blocking factor used to  distri-
*                                   bute the last  M_A-IMB_A rows of  A,
*                                   MB_A > 0.
*  NB_A    (global) DESCA( NB_    ) The blocking factor used to  distri-
*                                   bute the last  N_A-INB_A  columns of
*                                   A, NB_A > 0.
*  RSRC_A  (global) DESCA( RSRC_  ) The process row over which the first
*                                   row of the matrix  A is distributed,
*                                   NPROW > RSRC_A >= 0.
*  CSRC_A  (global) DESCA( CSRC_  ) The  process  column  over which the
*                                   first  column of  A  is distributed.
*                                   NPCOL > CSRC_A >= 0.
*  LLD_A   (local)  DESCA( LLD_   ) The  leading  dimension of the local
*                                   array  storing  the  local blocks of
*                                   the distributed matrix A,
*                                   IF( Lc( 1, N_A ) > 0 )
*                                      LLD_A >= MAX( 1, Lr( 1, M_A ) )
*                                   ELSE
*                                      LLD_A >= 1.
*
*  Let K be the number of  rows of a matrix A starting at the global in-
*  dex IA,i.e, A( IA:IA+K-1, : ). Lr( IA, K ) denotes the number of rows
*  that the process of row coordinate MYROW ( 0 <= MYROW < NPROW ) would
*  receive if these K rows were distributed over NPROW processes.  If  K
*  is the number of columns of a matrix  A  starting at the global index
*  JA, i.e, A( :, JA:JA+K-1, : ), Lc( JA, K ) denotes the number  of co-
*  lumns that the process MYCOL ( 0 <= MYCOL < NPCOL ) would  receive if
*  these K columns were distributed over NPCOL processes.
*
*  The values of Lr() and Lc() may be determined via a call to the func-
*  tion PB_NUMROC:
*  Lr( IA, K ) = PB_NUMROC( K, IA, IMB_A, MB_A, MYROW, RSRC_A, NPROW )
*  Lc( JA, K ) = PB_NUMROC( K, JA, INB_A, NB_A, MYCOL, CSRC_A, NPCOL )
*
*  Arguments
*  =========
*
*  M       (global input) INTEGER
*          On entry,  M  specifies the number of rows of  the  submatrix
*          sub( A ). M  must be at least zero.
*
*  N       (global input) INTEGER
*          On entry, N  specifies the number of columns of the submatrix
*          sub( A ). N must be at least zero.
*
*  A       (local input) REAL array
*          On entry, A is an array of dimension (LLD_A, Ka), where Ka is
*          at least Lc( 1, JA+N-1 ).  Before  entry, this array contains
*          the local entries of the matrix A.
*
*  IA      (global input) INTEGER
*          On entry, IA  specifies A's global row index, which points to
*          the beginning of the submatrix sub( A ).
*
*  JA      (global input) INTEGER
*          On entry, JA  specifies A's global column index, which points
*          to the beginning of the submatrix sub( A ).
*
*  DESCA   (global and local input) INTEGER array
*          On entry, DESCA  is an integer array of dimension DLEN_. This
*          is the array descriptor for the matrix A.
*
*  IRPRNT  (global input) INTEGER
*          On entry, IRPRNT specifies the row index of the printing pro-
*          cess.
*
*  ICPRNT  (global input) INTEGER
*          On entry, ICPRNT specifies the  column  index of the printing
*          process.
*
*  CMATNM  (global input) CHARACTER*(*)
*          On entry, CMATNM is the name of the matrix to be printed.
*
*  NOUT    (global input) INTEGER
*          On entry, NOUT specifies the output unit number. When NOUT is
*          equal to 6, the submatrix is printed on the screen.
*
*  WORK    (local workspace) REAL array
*          On entry, WORK is a work array of dimension at least equal to
*          MAX( IMB_A, MB_A ).
*
*  -- Written on April 1, 1998 by
*     Antoine Petitet, University  of  Tennessee, Knoxville 37996, USA.
*
*  =====================================================================
*
*     .. Parameters ..
      INTEGER            BLOCK_CYCLIC_2D_INB, CSRC_, CTXT_, DLEN_,
     $                   DTYPE_, IMB_, INB_, LLD_, MB_, M_, NB_, N_,
     $                   RSRC_
      parameter( block_cyclic_2d_inb = 2, dlen_ = 11,
     $                   dtype_ = 1, ctxt_ = 2, m_ = 3, n_ = 4,
     $                   imb_ = 5, inb_ = 6, mb_ = 7, nb_ = 8,
     $                   rsrc_ = 9, csrc_ = 10, lld_ = 11 )
*     ..
*     .. Local Scalars ..
      INTEGER            MYCOL, MYROW, NPCOL, NPROW, PCOL, PROW
*     ..
*     .. Local Arrays ..
      INTEGER            DESCA2( DLEN_ )
*     ..
*     .. External Subroutines ..
      EXTERNAL           blacs_gridinfo, pb_desctrans, pb_pslaprn2
*     ..
*     .. Executable Statements ..
*
*     Quick return if possible
*
      IF( ( m.LE.0 ).OR.( n.LE.0 ) )
     $   RETURN
*
*     Convert descriptor
*
      CALL pb_desctrans( desca, desca2 )
*
      CALL blacs_gridinfo( desca2( ctxt_ ), nprow, npcol, myrow, mycol )
*
      IF( desca2( rsrc_ ).GE.0 ) THEN
         IF( desca2( csrc_ ).GE.0 ) THEN
            CALL pb_pslaprn2( m, n, a, ia, ja, desca2, irprnt, icprnt,
     $                        cmatnm, nout, desca2( rsrc_ ),
     $                        desca2( csrc_ ), work )
         ELSE
            DO 10 pcol = 0, npcol - 1
               IF( ( myrow.EQ.irprnt ).AND.( mycol.EQ.icprnt ) )
     $            WRITE( nout, * ) 'Colum-replicated array -- ' ,
     $                             'copy in process column: ', pcol
               CALL pb_pslaprn2( m, n, a, ia, ja, desca2, irprnt,
     $                           icprnt, cmatnm, nout, desca2( rsrc_ ),
     $                           pcol, work )
   10       CONTINUE
         END IF
      ELSE
         IF( desca2( csrc_ ).GE.0 ) THEN
            DO 20 prow = 0, nprow - 1
               IF( ( myrow.EQ.irprnt ).AND.( mycol.EQ.icprnt ) )
     $            WRITE( nout, * ) 'Row-replicated array -- ' ,
     $                             'copy in process row: ', prow
               CALL pb_pslaprn2( m, n, a, ia, ja, desca2, irprnt,
     $                           icprnt, cmatnm, nout, prow,
     $                           desca2( csrc_ ), work )
   20       CONTINUE
         ELSE
            DO 40 prow = 0, nprow - 1
               DO 30 pcol = 0, npcol - 1
                  IF( ( myrow.EQ.irprnt ).AND.( mycol.EQ.icprnt ) )
     $               WRITE( nout, * ) 'Replicated array -- ' ,
     $                      'copy in process (', prow, ',', pcol, ')'
                  CALL pb_pslaprn2( m, n, a, ia, ja, desca2, irprnt,
     $                              icprnt, cmatnm, nout, prow, pcol,
     $                              work )
   30          CONTINUE
   40       CONTINUE
         END IF
      END IF
*
      RETURN
*
*     End of PB_PSLAPRNT
*

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