pb_dfillpad()

subroutine pb_dfillpad	(	integer	ictxt,
		integer	m,
		integer	n,
		double precision, dimension( * )	a,
		integer	lda,
		integer	ipre,
		integer	ipost,
		double precision	chkval
	)

Definition at line 9078 of file pdblastst.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            ICTXT, IPOST, IPRE, LDA, M, N
      DOUBLE PRECISION   CHKVAL
*     ..
*     .. Array Arguments ..
      DOUBLE PRECISION   A( * )
*     ..
*
*  Purpose
*  =======
*
*  PB_DFILLPAD surrounds a two dimensional local array with a guard-zone
*  initialized to the value CHKVAL. The user may later call the  routine
*  PB_DCHEKPAD to discover if the guardzone has been violated. There are
*  three guardzones. The first is a buffer of size  IPRE  that is before
*  the start of the array. The second is the buffer of size IPOST  which
*  is after the end of the array to be padded. Finally, there is a guard
*  zone inside every column of the array to be padded, in  the  elements
*  of A(M+1:LDA, J).
*
*  Arguments
*  =========
*
*  ICTXT   (local input) INTEGER
*          On entry,  ICTXT  specifies the BLACS context handle, indica-
*          ting the global  context of the operation. The context itself
*          is global, but the value of ICTXT is local.
*
*  M       (local input) INTEGER
*          On entry, M  specifies the number of rows in the local  array
*          A.  M must be at least zero.
*
*  N       (local input) INTEGER
*          On entry, N  specifies the number of columns in the local ar-
*          ray A. N must be at least zero.
*
*  A       (local input/local output) DOUBLE PRECISION array
*          On entry,  A  is an array of dimension (LDA,N). On exit, this
*          array is the padded array.
*
*  LDA     (local input) INTEGER
*          On entry,  LDA  specifies  the leading dimension of the local
*          array to be padded. LDA must be at least MAX( 1, M ).
*
*  IPRE    (local input) INTEGER
*          On entry, IPRE specifies the size of  the  guard zone  to put
*          before the start of the padded array.
*
*  IPOST   (local input) INTEGER
*          On entry, IPOST specifies the size of the  guard zone  to put
*          after the end of the padded array.
*
*  CHKVAL  (local input) DOUBLE PRECISION
*          On entry, CHKVAL specifies the value to pad the array with.
*
*  -- Written on April 1, 1998 by
*     R. Clint Whaley, University of Tennessee, Knoxville 37996, USA.
*
*  =====================================================================
*
*     .. Local Scalars ..
      INTEGER            I, J, K
*     ..
*     .. Executable Statements ..
*
*     Put check buffer in front of A
*
      IF( ipre.GT.0 ) THEN
         DO 10 i = 1, ipre
            a( i ) = chkval
   10    CONTINUE
      ELSE
         WRITE( *, fmt = '(A)' )
     $          'WARNING no pre-guardzone in PB_DFILLPAD'
      END IF
*
*     Put check buffer in back of A
*
      IF( ipost.GT.0 ) THEN
         j = ipre+lda*n+1
         DO 20 i = j, j+ipost-1
            a( i ) = chkval
   20    CONTINUE
      ELSE
         WRITE( *, fmt = '(A)' )
     $          'WARNING no post-guardzone in PB_DFILLPAD'
      END IF
*
*     Put check buffer in all (LDA-M) gaps
*
      IF( lda.GT.m ) THEN
         k = ipre + m + 1
         DO 40 j = 1, n
            DO 30 i = k, k + ( lda - m ) - 1
               a( i ) = chkval
   30       CONTINUE
            k = k + lda
   40    CONTINUE
      END IF
*
      RETURN
*
*     End of PB_DFILLPAD
*

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