Julie
e18d437924
GitHub is now enabling us to track accurately version and date. No need for this anymore.
149 lines
3.4 KiB
FortranFixed
149 lines
3.4 KiB
FortranFixed
*> \brief \b DLAORD
|
|
*
|
|
* =========== DOCUMENTATION ===========
|
|
*
|
|
* Online html documentation available at
|
|
* http://www.netlib.org/lapack/explore-html/
|
|
*
|
|
* Definition:
|
|
* ===========
|
|
*
|
|
* SUBROUTINE DLAORD( JOB, N, X, INCX )
|
|
*
|
|
* .. Scalar Arguments ..
|
|
* CHARACTER JOB
|
|
* INTEGER INCX, N
|
|
* ..
|
|
* .. Array Arguments ..
|
|
* DOUBLE PRECISION X( * )
|
|
* ..
|
|
*
|
|
*
|
|
*> \par Purpose:
|
|
* =============
|
|
*>
|
|
*> \verbatim
|
|
*>
|
|
*> DLAORD sorts the elements of a vector x in increasing or decreasing
|
|
*> order.
|
|
*> \endverbatim
|
|
*
|
|
* Arguments:
|
|
* ==========
|
|
*
|
|
*> \param[in] JOB
|
|
*> \verbatim
|
|
*> JOB is CHARACTER
|
|
*> = 'I': Sort in increasing order
|
|
*> = 'D': Sort in decreasing order
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in] N
|
|
*> \verbatim
|
|
*> N is INTEGER
|
|
*> The length of the vector X.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in,out] X
|
|
*> \verbatim
|
|
*> X is DOUBLE PRECISION array, dimension
|
|
*> (1+(N-1)*INCX)
|
|
*> On entry, the vector of length n to be sorted.
|
|
*> On exit, the vector x is sorted in the prescribed order.
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in] INCX
|
|
*> \verbatim
|
|
*> INCX is INTEGER
|
|
*> The spacing between successive elements of X. INCX >= 0.
|
|
*> \endverbatim
|
|
*
|
|
* Authors:
|
|
* ========
|
|
*
|
|
*> \author Univ. of Tennessee
|
|
*> \author Univ. of California Berkeley
|
|
*> \author Univ. of Colorado Denver
|
|
*> \author NAG Ltd.
|
|
*
|
|
*> \ingroup double_lin
|
|
*
|
|
* =====================================================================
|
|
SUBROUTINE DLAORD( JOB, N, X, INCX )
|
|
*
|
|
* -- LAPACK test routine --
|
|
* -- LAPACK is a software package provided by Univ. of Tennessee, --
|
|
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
|
|
*
|
|
* .. Scalar Arguments ..
|
|
CHARACTER JOB
|
|
INTEGER INCX, N
|
|
* ..
|
|
* .. Array Arguments ..
|
|
DOUBLE PRECISION X( * )
|
|
* ..
|
|
*
|
|
* =====================================================================
|
|
*
|
|
* .. Local Scalars ..
|
|
INTEGER I, INC, IX, IXNEXT
|
|
DOUBLE PRECISION TEMP
|
|
* ..
|
|
* .. External Functions ..
|
|
LOGICAL LSAME
|
|
EXTERNAL LSAME
|
|
* ..
|
|
* .. Intrinsic Functions ..
|
|
INTRINSIC ABS
|
|
* ..
|
|
* .. Executable Statements ..
|
|
*
|
|
INC = ABS( INCX )
|
|
IF( LSAME( JOB, 'I' ) ) THEN
|
|
*
|
|
* Sort in increasing order
|
|
*
|
|
DO 20 I = 2, N
|
|
IX = 1 + ( I-1 )*INC
|
|
10 CONTINUE
|
|
IF( IX.EQ.1 )
|
|
$ GO TO 20
|
|
IXNEXT = IX - INC
|
|
IF( X( IX ).GT.X( IXNEXT ) ) THEN
|
|
GO TO 20
|
|
ELSE
|
|
TEMP = X( IX )
|
|
X( IX ) = X( IXNEXT )
|
|
X( IXNEXT ) = TEMP
|
|
END IF
|
|
IX = IXNEXT
|
|
GO TO 10
|
|
20 CONTINUE
|
|
*
|
|
ELSE IF( LSAME( JOB, 'D' ) ) THEN
|
|
*
|
|
* Sort in decreasing order
|
|
*
|
|
DO 40 I = 2, N
|
|
IX = 1 + ( I-1 )*INC
|
|
30 CONTINUE
|
|
IF( IX.EQ.1 )
|
|
$ GO TO 40
|
|
IXNEXT = IX - INC
|
|
IF( X( IX ).LT.X( IXNEXT ) ) THEN
|
|
GO TO 40
|
|
ELSE
|
|
TEMP = X( IX )
|
|
X( IX ) = X( IXNEXT )
|
|
X( IXNEXT ) = TEMP
|
|
END IF
|
|
IX = IXNEXT
|
|
GO TO 30
|
|
40 CONTINUE
|
|
END IF
|
|
RETURN
|
|
*
|
|
* End of DLAORD
|
|
*
|
|
END
|