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SUBROUTINE PBCTRADD( ICONTXT, UPLO, FORM, M, N, ALPHA, A, LDA,
$ BETA, B, LDB, MINT, NINT, MEN, NEN )
*
* -- PB-BLAS routine (version 2.1) --
* University of Tennessee, Knoxville, Oak Ridge National Laboratory.
* April 28, 1996
*
* .. Scalar Arguments ..
CHARACTER FORM, UPLO
INTEGER ICONTXT, LDA, LDB, M, MEN, MINT, N, NEN, NINT
COMPLEX ALPHA, BETA
* ..
* .. Array Arguments ..
COMPLEX A( LDA, * ), B( LDB, * )
* ..
*
* Purpose
* =======
*
* PCTRADD copies part of an upper (or lower) triangular matrix A
* to another matrix B:
* B <== alpha * A + beta * B
*
* =====================================================================
*
* .. Local Scalars ..
INTEGER I, J, JP, JX, MM, MX
* ..
* .. External Functions ..
LOGICAL LSAME
INTEGER ICEIL
EXTERNAL ICEIL, LSAME
* ..
* .. External Subroutines ..
EXTERNAL PBCMATADD, PBCVECADD
* ..
* .. Intrinsic Functions ..
INTRINSIC MIN, REAL
* ..
* .. Executable Statements ..
*
IF( LSAME( UPLO, 'U' ) ) THEN
*
IF( LSAME( FORM, 'T' ) ) THEN
*
* A is upper triangular (triangular part is at the bottom)
*
MM = M
JP = 0
DO 20 I = 1, ICEIL( NEN, NINT )
DO 10 J = 1, MIN( N, NEN-JP )
JX = JP + J
CALL PBCVECADD( ICONTXT, 'G', MM+J, ALPHA, A( 1, JX ),
$ 1, BETA, B( 1, JX ), 1 )
10 CONTINUE
MM = MM + MINT
JP = JP + NINT
20 CONTINUE
*
ELSE IF( LSAME( FORM, 'H' ) ) THEN
*
* A is upper triangular Hermitian
*
MM = M
JP = 0
DO 40 I = 1, ICEIL( NEN, NINT )
DO 30 J = 1, MIN( N, NEN-JP )
JX = JP + J
CALL PBCVECADD( ICONTXT, 'G', MM+J-1, ALPHA,
$ A( 1, JX ), 1, BETA, B( 1, JX ), 1 )
B( MM+J, JX ) = REAL( BETA ) * REAL( B( MM+J, JX ) ) +
$ REAL( ALPHA )* REAL( A( MM+J, JX ) )
30 CONTINUE
MM = MM + MINT
JP = JP + NINT
40 CONTINUE
*
ELSE
*
* A is a rectangular matrix
*
MM = M
JP = 1
DO 50 I = 1, ICEIL( NEN, NINT )
CALL PBCMATADD( ICONTXT, 'G', MM, MIN( N, NEN-JP+1 ),
$ ALPHA, A( 1, JP ), LDA, BETA, B( 1, JP ),
$ LDB )
MM = MM + MINT
JP = JP + NINT
50 CONTINUE
END IF
*
ELSE
*
IF( LSAME( FORM, 'T' ) ) THEN
*
* A is lower triangular (triangular part is at the top)
*
MM = M
JP = 0
DO 70 I = 1, ICEIL( NEN, NINT )
DO 60 J = 1, MIN( N, NEN-JP )
MX = MM + J
JX = JP + J
IF( MX.LE.MEN )
$ CALL PBCVECADD( ICONTXT, 'G', MEN-MX+1, ALPHA,
$ A( MX, JX ), 1, BETA, B( MX, JX ),
$ 1 )
60 CONTINUE
MM = MM + MINT
JP = JP + NINT
70 CONTINUE
*
ELSE IF( LSAME( FORM, 'H' ) ) THEN
*
* A is lower triangular Hermitian
*
MM = M
JP = 0
DO 90 I = 1, ICEIL( NEN, NINT )
DO 80 J = 1, MIN( N, NEN-JP )
MX = MM + J
JX = JP + J
IF( MX.LE.MEN ) THEN
B( MX, JX ) = REAL( BETA ) * REAL( B( MX, JX ) ) +
$ REAL( ALPHA ) * REAL( A( MX, JX ) )
CALL PBCVECADD( ICONTXT, 'G', MEN-MX, ALPHA,
$ A( MX+1, JX ), 1, BETA,
$ B( MX+1, JX ), 1 )
END IF
80 CONTINUE
MM = MM + MINT
JP = JP + NINT
90 CONTINUE
*
ELSE
*
* A is a rectangular matrix
*
MM = M + 1
JP = 1
DO 100 I = 1, ICEIL( NEN, NINT )
CALL PBCMATADD( ICONTXT, 'G', MEN-MM+1,
$ MIN( N, NEN-JP+1 ), ALPHA, A( MM, JP ),
$ LDA, BETA, B( MM, JP ), LDB )
MM = MM + MINT
JP = JP + NINT
100 CONTINUE
END IF
END IF
*
RETURN
*
* End of PBCTRADD
*
END
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