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Diffstat (limited to 'src/lib/blas/dgemv.f')
| -rw-r--r-- | src/lib/blas/dgemv.f | 261 |
1 files changed, 0 insertions, 261 deletions
diff --git a/src/lib/blas/dgemv.f b/src/lib/blas/dgemv.f deleted file mode 100644 index 8ef80b3a..00000000 --- a/src/lib/blas/dgemv.f +++ /dev/null @@ -1,261 +0,0 @@ - SUBROUTINE DGEMV ( TRANS, M, N, ALPHA, A, LDA, X, INCX, - $ BETA, Y, INCY ) -* .. Scalar Arguments .. - DOUBLE PRECISION ALPHA, BETA - INTEGER INCX, INCY, LDA, M, N - CHARACTER*1 TRANS -* .. Array Arguments .. - DOUBLE PRECISION A( LDA, * ), X( * ), Y( * ) -* .. -* -* Purpose -* ======= -* -* DGEMV performs one of the matrix-vector operations -* -* y := alpha*A*x + beta*y, or y := alpha*A'*x + beta*y, -* -* where alpha and beta are scalars, x and y are vectors and A is an -* m by n matrix. -* -* Parameters -* ========== -* -* TRANS - CHARACTER*1. -* On entry, TRANS specifies the operation to be performed as -* follows: -* -* TRANS = 'N' or 'n' y := alpha*A*x + beta*y. -* -* TRANS = 'T' or 't' y := alpha*A'*x + beta*y. -* -* TRANS = 'C' or 'c' y := alpha*A'*x + beta*y. -* -* Unchanged on exit. -* -* M - INTEGER. -* On entry, M specifies the number of rows of the matrix A. -* M must be at least zero. -* Unchanged on exit. -* -* N - INTEGER. -* On entry, N specifies the number of columns of the matrix A. -* N must be at least zero. -* Unchanged on exit. -* -* ALPHA - DOUBLE PRECISION. -* On entry, ALPHA specifies the scalar alpha. -* Unchanged on exit. -* -* A - DOUBLE PRECISION array of DIMENSION ( LDA, n ). -* Before entry, the leading m by n part of the array A must -* contain the matrix of coefficients. -* Unchanged on exit. -* -* LDA - INTEGER. -* On entry, LDA specifies the first dimension of A as declared -* in the calling (sub) program. LDA must be at least -* max( 1, m ). -* Unchanged on exit. -* -* X - DOUBLE PRECISION array of DIMENSION at least -* ( 1 + ( n - 1 )*abs( INCX ) ) when TRANS = 'N' or 'n' -* and at least -* ( 1 + ( m - 1 )*abs( INCX ) ) otherwise. -* Before entry, the incremented array X must contain the -* vector x. -* Unchanged on exit. -* -* INCX - INTEGER. -* On entry, INCX specifies the increment for the elements of -* X. INCX must not be zero. -* Unchanged on exit. -* -* BETA - DOUBLE PRECISION. -* On entry, BETA specifies the scalar beta. When BETA is -* supplied as zero then Y need not be set on input. -* Unchanged on exit. -* -* Y - DOUBLE PRECISION array of DIMENSION at least -* ( 1 + ( m - 1 )*abs( INCY ) ) when TRANS = 'N' or 'n' -* and at least -* ( 1 + ( n - 1 )*abs( INCY ) ) otherwise. -* Before entry with BETA non-zero, the incremented array Y -* must contain the vector y. On exit, Y is overwritten by the -* updated vector y. -* -* INCY - INTEGER. -* On entry, INCY specifies the increment for the elements of -* Y. INCY must not be zero. -* Unchanged on exit. -* -* -* Level 2 Blas routine. -* -* -- Written on 22-October-1986. -* Jack Dongarra, Argonne National Lab. -* Jeremy Du Croz, Nag Central Office. -* Sven Hammarling, Nag Central Office. -* Richard Hanson, Sandia National Labs. -* -* -* .. Parameters .. - DOUBLE PRECISION ONE , ZERO - PARAMETER ( ONE = 1.0D+0, ZERO = 0.0D+0 ) -* .. Local Scalars .. - DOUBLE PRECISION TEMP - INTEGER I, INFO, IX, IY, J, JX, JY, KX, KY, LENX, LENY -* .. External Functions .. - LOGICAL LSAME - EXTERNAL LSAME -* .. External Subroutines .. - EXTERNAL XERBLA -* .. Intrinsic Functions .. - INTRINSIC MAX -* .. -* .. Executable Statements .. -* -* Test the input parameters. -* - INFO = 0 - IF ( .NOT.LSAME( TRANS, 'N' ).AND. - $ .NOT.LSAME( TRANS, 'T' ).AND. - $ .NOT.LSAME( TRANS, 'C' ) )THEN - INFO = 1 - ELSE IF( M.LT.0 )THEN - INFO = 2 - ELSE IF( N.LT.0 )THEN - INFO = 3 - ELSE IF( LDA.LT.MAX( 1, M ) )THEN - INFO = 6 - ELSE IF( INCX.EQ.0 )THEN - INFO = 8 - ELSE IF( INCY.EQ.0 )THEN - INFO = 11 - END IF - IF( INFO.NE.0 )THEN - CALL XERBLA( 'DGEMV ', INFO ) - RETURN - END IF -* -* Quick return if possible. -* - IF( ( M.EQ.0 ).OR.( N.EQ.0 ).OR. - $ ( ( ALPHA.EQ.ZERO ).AND.( BETA.EQ.ONE ) ) ) - $ RETURN -* -* Set LENX and LENY, the lengths of the vectors x and y, and set -* up the start points in X and Y. -* - IF( LSAME( TRANS, 'N' ) )THEN - LENX = N - LENY = M - ELSE - LENX = M - LENY = N - END IF - IF( INCX.GT.0 )THEN - KX = 1 - ELSE - KX = 1 - ( LENX - 1 )*INCX - END IF - IF( INCY.GT.0 )THEN - KY = 1 - ELSE - KY = 1 - ( LENY - 1 )*INCY - END IF -* -* Start the operations. In this version the elements of A are -* accessed sequentially with one pass through A. -* -* First form y := beta*y. -* - IF( BETA.NE.ONE )THEN - IF( INCY.EQ.1 )THEN - IF( BETA.EQ.ZERO )THEN - DO 10, I = 1, LENY - Y( I ) = ZERO - 10 CONTINUE - ELSE - DO 20, I = 1, LENY - Y( I ) = BETA*Y( I ) - 20 CONTINUE - END IF - ELSE - IY = KY - IF( BETA.EQ.ZERO )THEN - DO 30, I = 1, LENY - Y( IY ) = ZERO - IY = IY + INCY - 30 CONTINUE - ELSE - DO 40, I = 1, LENY - Y( IY ) = BETA*Y( IY ) - IY = IY + INCY - 40 CONTINUE - END IF - END IF - END IF - IF( ALPHA.EQ.ZERO ) - $ RETURN - IF( LSAME( TRANS, 'N' ) )THEN -* -* Form y := alpha*A*x + y. -* - JX = KX - IF( INCY.EQ.1 )THEN - DO 60, J = 1, N - IF( X( JX ).NE.ZERO )THEN - TEMP = ALPHA*X( JX ) - DO 50, I = 1, M - Y( I ) = Y( I ) + TEMP*A( I, J ) - 50 CONTINUE - END IF - JX = JX + INCX - 60 CONTINUE - ELSE - DO 80, J = 1, N - IF( X( JX ).NE.ZERO )THEN - TEMP = ALPHA*X( JX ) - IY = KY - DO 70, I = 1, M - Y( IY ) = Y( IY ) + TEMP*A( I, J ) - IY = IY + INCY - 70 CONTINUE - END IF - JX = JX + INCX - 80 CONTINUE - END IF - ELSE -* -* Form y := alpha*A'*x + y. -* - JY = KY - IF( INCX.EQ.1 )THEN - DO 100, J = 1, N - TEMP = ZERO - DO 90, I = 1, M - TEMP = TEMP + A( I, J )*X( I ) - 90 CONTINUE - Y( JY ) = Y( JY ) + ALPHA*TEMP - JY = JY + INCY - 100 CONTINUE - ELSE - DO 120, J = 1, N - TEMP = ZERO - IX = KX - DO 110, I = 1, M - TEMP = TEMP + A( I, J )*X( IX ) - IX = IX + INCX - 110 CONTINUE - Y( JY ) = Y( JY ) + ALPHA*TEMP - JY = JY + INCY - 120 CONTINUE - END IF - END IF -* - RETURN -* -* End of DGEMV . -* - END |