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Diffstat (limited to 'src/lib/blas/dspr2.f')
| -rw-r--r-- | src/lib/blas/dspr2.f | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/src/lib/blas/dspr2.f b/src/lib/blas/dspr2.f deleted file mode 100644 index 1cfce21b..00000000 --- a/src/lib/blas/dspr2.f +++ /dev/null @@ -1,229 +0,0 @@ - SUBROUTINE DSPR2 ( UPLO, N, ALPHA, X, INCX, Y, INCY, AP ) -* .. Scalar Arguments .. - DOUBLE PRECISION ALPHA - INTEGER INCX, INCY, N - CHARACTER*1 UPLO -* .. Array Arguments .. - DOUBLE PRECISION AP( * ), X( * ), Y( * ) -* .. -* -* Purpose -* ======= -* -* DSPR2 performs the symmetric rank 2 operation -* -* A := alpha*x*y' + alpha*y*x' + A, -* -* where alpha is a scalar, x and y are n element vectors and A is an -* n by n symmetric matrix, supplied in packed form. -* -* Parameters -* ========== -* -* UPLO - CHARACTER*1. -* On entry, UPLO specifies whether the upper or lower -* triangular part of the matrix A is supplied in the packed -* array AP as follows: -* -* UPLO = 'U' or 'u' The upper triangular part of A is -* supplied in AP. -* -* UPLO = 'L' or 'l' The lower triangular part of A is -* supplied in AP. -* -* Unchanged on exit. -* -* N - INTEGER. -* On entry, N specifies the order 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. -* -* X - DOUBLE PRECISION array of dimension at least -* ( 1 + ( n - 1 )*abs( INCX ) ). -* Before entry, the incremented array X must contain the n -* element 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. -* -* Y - DOUBLE PRECISION array of dimension at least -* ( 1 + ( n - 1 )*abs( INCY ) ). -* Before entry, the incremented array Y must contain the n -* element vector y. -* Unchanged on exit. -* -* INCY - INTEGER. -* On entry, INCY specifies the increment for the elements of -* Y. INCY must not be zero. -* Unchanged on exit. -* -* AP - DOUBLE PRECISION array of DIMENSION at least -* ( ( n*( n + 1 ) )/2 ). -* Before entry with UPLO = 'U' or 'u', the array AP must -* contain the upper triangular part of the symmetric matrix -* packed sequentially, column by column, so that AP( 1 ) -* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 ) -* and a( 2, 2 ) respectively, and so on. On exit, the array -* AP is overwritten by the upper triangular part of the -* updated matrix. -* Before entry with UPLO = 'L' or 'l', the array AP must -* contain the lower triangular part of the symmetric matrix -* packed sequentially, column by column, so that AP( 1 ) -* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 ) -* and a( 3, 1 ) respectively, and so on. On exit, the array -* AP is overwritten by the lower triangular part of the -* updated matrix. -* -* -* 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 ZERO - PARAMETER ( ZERO = 0.0D+0 ) -* .. Local Scalars .. - DOUBLE PRECISION TEMP1, TEMP2 - INTEGER I, INFO, IX, IY, J, JX, JY, K, KK, KX, KY -* .. External Functions .. - LOGICAL LSAME - EXTERNAL LSAME -* .. External Subroutines .. - EXTERNAL XERBLA -* .. -* .. Executable Statements .. -* -* Test the input parameters. -* - INFO = 0 - IF ( .NOT.LSAME( UPLO, 'U' ).AND. - $ .NOT.LSAME( UPLO, 'L' ) )THEN - INFO = 1 - ELSE IF( N.LT.0 )THEN - INFO = 2 - ELSE IF( INCX.EQ.0 )THEN - INFO = 5 - ELSE IF( INCY.EQ.0 )THEN - INFO = 7 - END IF - IF( INFO.NE.0 )THEN - CALL XERBLA( 'DSPR2 ', INFO ) - RETURN - END IF -* -* Quick return if possible. -* - IF( ( N.EQ.0 ).OR.( ALPHA.EQ.ZERO ) ) - $ RETURN -* -* Set up the start points in X and Y if the increments are not both -* unity. -* - IF( ( INCX.NE.1 ).OR.( INCY.NE.1 ) )THEN - IF( INCX.GT.0 )THEN - KX = 1 - ELSE - KX = 1 - ( N - 1 )*INCX - END IF - IF( INCY.GT.0 )THEN - KY = 1 - ELSE - KY = 1 - ( N - 1 )*INCY - END IF - JX = KX - JY = KY - END IF -* -* Start the operations. In this version the elements of the array AP -* are accessed sequentially with one pass through AP. -* - KK = 1 - IF( LSAME( UPLO, 'U' ) )THEN -* -* Form A when upper triangle is stored in AP. -* - IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN - DO 20, J = 1, N - IF( ( X( J ).NE.ZERO ).OR.( Y( J ).NE.ZERO ) )THEN - TEMP1 = ALPHA*Y( J ) - TEMP2 = ALPHA*X( J ) - K = KK - DO 10, I = 1, J - AP( K ) = AP( K ) + X( I )*TEMP1 + Y( I )*TEMP2 - K = K + 1 - 10 CONTINUE - END IF - KK = KK + J - 20 CONTINUE - ELSE - DO 40, J = 1, N - IF( ( X( JX ).NE.ZERO ).OR.( Y( JY ).NE.ZERO ) )THEN - TEMP1 = ALPHA*Y( JY ) - TEMP2 = ALPHA*X( JX ) - IX = KX - IY = KY - DO 30, K = KK, KK + J - 1 - AP( K ) = AP( K ) + X( IX )*TEMP1 + Y( IY )*TEMP2 - IX = IX + INCX - IY = IY + INCY - 30 CONTINUE - END IF - JX = JX + INCX - JY = JY + INCY - KK = KK + J - 40 CONTINUE - END IF - ELSE -* -* Form A when lower triangle is stored in AP. -* - IF( ( INCX.EQ.1 ).AND.( INCY.EQ.1 ) )THEN - DO 60, J = 1, N - IF( ( X( J ).NE.ZERO ).OR.( Y( J ).NE.ZERO ) )THEN - TEMP1 = ALPHA*Y( J ) - TEMP2 = ALPHA*X( J ) - K = KK - DO 50, I = J, N - AP( K ) = AP( K ) + X( I )*TEMP1 + Y( I )*TEMP2 - K = K + 1 - 50 CONTINUE - END IF - KK = KK + N - J + 1 - 60 CONTINUE - ELSE - DO 80, J = 1, N - IF( ( X( JX ).NE.ZERO ).OR.( Y( JY ).NE.ZERO ) )THEN - TEMP1 = ALPHA*Y( JY ) - TEMP2 = ALPHA*X( JX ) - IX = JX - IY = JY - DO 70, K = KK, KK + N - J - AP( K ) = AP( K ) + X( IX )*TEMP1 + Y( IY )*TEMP2 - IX = IX + INCX - IY = IY + INCY - 70 CONTINUE - END IF - JX = JX + INCX - JY = JY + INCY - KK = KK + N - J + 1 - 80 CONTINUE - END IF - END IF -* - RETURN -* -* End of DSPR2 . -* - END |