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Diffstat (limited to 'src/lib/blas/zher.f')
| -rw-r--r-- | src/lib/blas/zher.f | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/src/lib/blas/zher.f b/src/lib/blas/zher.f deleted file mode 100644 index fcf40a5e..00000000 --- a/src/lib/blas/zher.f +++ /dev/null @@ -1,212 +0,0 @@ - SUBROUTINE ZHER ( UPLO, N, ALPHA, X, INCX, A, LDA ) -* .. Scalar Arguments .. - DOUBLE PRECISION ALPHA - INTEGER INCX, LDA, N - CHARACTER*1 UPLO -* .. Array Arguments .. - COMPLEX*16 A( LDA, * ), X( * ) -* .. -* -* Purpose -* ======= -* -* ZHER performs the hermitian rank 1 operation -* -* A := alpha*x*conjg( x' ) + A, -* -* where alpha is a real scalar, x is an n element vector and A is an -* n by n hermitian matrix. -* -* Parameters -* ========== -* -* UPLO - CHARACTER*1. -* On entry, UPLO specifies whether the upper or lower -* triangular part of the array A is to be referenced as -* follows: -* -* UPLO = 'U' or 'u' Only the upper triangular part of A -* is to be referenced. -* -* UPLO = 'L' or 'l' Only the lower triangular part of A -* is to be referenced. -* -* 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 - COMPLEX*16 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. -* -* A - COMPLEX*16 array of DIMENSION ( LDA, n ). -* Before entry with UPLO = 'U' or 'u', the leading n by n -* upper triangular part of the array A must contain the upper -* triangular part of the hermitian matrix and the strictly -* lower triangular part of A is not referenced. On exit, the -* upper triangular part of the array A is overwritten by the -* upper triangular part of the updated matrix. -* Before entry with UPLO = 'L' or 'l', the leading n by n -* lower triangular part of the array A must contain the lower -* triangular part of the hermitian matrix and the strictly -* upper triangular part of A is not referenced. On exit, the -* lower triangular part of the array A is overwritten by the -* lower triangular part of the updated matrix. -* Note that the imaginary parts of the diagonal elements need -* not be set, they are assumed to be zero, and on exit they -* are set to zero. -* -* 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, n ). -* 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 .. - COMPLEX*16 ZERO - PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ) ) -* .. Local Scalars .. - COMPLEX*16 TEMP - INTEGER I, INFO, IX, J, JX, KX -* .. External Functions .. - LOGICAL LSAME - EXTERNAL LSAME -* .. External Subroutines .. - EXTERNAL XERBLA -* .. Intrinsic Functions .. - INTRINSIC DCONJG, MAX, DBLE -* .. -* .. 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( LDA.LT.MAX( 1, N ) )THEN - INFO = 7 - END IF - IF( INFO.NE.0 )THEN - CALL XERBLA( 'ZHER ', INFO ) - RETURN - END IF -* -* Quick return if possible. -* - IF( ( N.EQ.0 ).OR.( ALPHA.EQ.DBLE( ZERO ) ) ) - $ RETURN -* -* Set the start point in X if the increment is not unity. -* - IF( INCX.LE.0 )THEN - KX = 1 - ( N - 1 )*INCX - ELSE IF( INCX.NE.1 )THEN - KX = 1 - END IF -* -* Start the operations. In this version the elements of A are -* accessed sequentially with one pass through the triangular part -* of A. -* - IF( LSAME( UPLO, 'U' ) )THEN -* -* Form A when A is stored in upper triangle. -* - IF( INCX.EQ.1 )THEN - DO 20, J = 1, N - IF( X( J ).NE.ZERO )THEN - TEMP = ALPHA*DCONJG( X( J ) ) - DO 10, I = 1, J - 1 - A( I, J ) = A( I, J ) + X( I )*TEMP - 10 CONTINUE - A( J, J ) = DBLE( A( J, J ) ) + DBLE( X( J )*TEMP ) - ELSE - A( J, J ) = DBLE( A( J, J ) ) - END IF - 20 CONTINUE - ELSE - JX = KX - DO 40, J = 1, N - IF( X( JX ).NE.ZERO )THEN - TEMP = ALPHA*DCONJG( X( JX ) ) - IX = KX - DO 30, I = 1, J - 1 - A( I, J ) = A( I, J ) + X( IX )*TEMP - IX = IX + INCX - 30 CONTINUE - A( J, J ) = DBLE( A( J, J ) ) + DBLE( X( JX )*TEMP ) - ELSE - A( J, J ) = DBLE( A( J, J ) ) - END IF - JX = JX + INCX - 40 CONTINUE - END IF - ELSE -* -* Form A when A is stored in lower triangle. -* - IF( INCX.EQ.1 )THEN - DO 60, J = 1, N - IF( X( J ).NE.ZERO )THEN - TEMP = ALPHA*DCONJG( X( J ) ) - A( J, J ) = DBLE( A( J, J ) ) + DBLE( TEMP*X( J ) ) - DO 50, I = J + 1, N - A( I, J ) = A( I, J ) + X( I )*TEMP - 50 CONTINUE - ELSE - A( J, J ) = DBLE( A( J, J ) ) - END IF - 60 CONTINUE - ELSE - JX = KX - DO 80, J = 1, N - IF( X( JX ).NE.ZERO )THEN - TEMP = ALPHA*DCONJG( X( JX ) ) - A( J, J ) = DBLE( A( J, J ) ) + DBLE( TEMP*X( JX ) ) - IX = JX - DO 70, I = J + 1, N - IX = IX + INCX - A( I, J ) = A( I, J ) + X( IX )*TEMP - 70 CONTINUE - ELSE - A( J, J ) = DBLE( A( J, J ) ) - END IF - JX = JX + INCX - 80 CONTINUE - END IF - END IF -* - RETURN -* -* End of ZHER . -* - END |