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authorjofret2009-04-28 07:17:00 +0000
committerjofret2009-04-28 07:17:00 +0000
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Moving lapack to right place
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- SUBROUTINE DRSCL( N, SA, SX, INCX )
-*
-* -- LAPACK auxiliary routine (version 3.1) --
-* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
-* November 2006
-*
-* .. Scalar Arguments ..
- INTEGER INCX, N
- DOUBLE PRECISION SA
-* ..
-* .. Array Arguments ..
- DOUBLE PRECISION SX( * )
-* ..
-*
-* Purpose
-* =======
-*
-* DRSCL multiplies an n-element real vector x by the real scalar 1/a.
-* This is done without overflow or underflow as long as
-* the final result x/a does not overflow or underflow.
-*
-* Arguments
-* =========
-*
-* N (input) INTEGER
-* The number of components of the vector x.
-*
-* SA (input) DOUBLE PRECISION
-* The scalar a which is used to divide each component of x.
-* SA must be >= 0, or the subroutine will divide by zero.
-*
-* SX (input/output) DOUBLE PRECISION array, dimension
-* (1+(N-1)*abs(INCX))
-* The n-element vector x.
-*
-* INCX (input) INTEGER
-* The increment between successive values of the vector SX.
-* > 0: SX(1) = X(1) and SX(1+(i-1)*INCX) = x(i), 1< i<= n
-*
-* =====================================================================
-*
-* .. Parameters ..
- DOUBLE PRECISION ONE, ZERO
- PARAMETER ( ONE = 1.0D+0, ZERO = 0.0D+0 )
-* ..
-* .. Local Scalars ..
- LOGICAL DONE
- DOUBLE PRECISION BIGNUM, CDEN, CDEN1, CNUM, CNUM1, MUL, SMLNUM
-* ..
-* .. External Functions ..
- DOUBLE PRECISION DLAMCH
- EXTERNAL DLAMCH
-* ..
-* .. External Subroutines ..
- EXTERNAL DSCAL
-* ..
-* .. Intrinsic Functions ..
- INTRINSIC ABS
-* ..
-* .. Executable Statements ..
-*
-* Quick return if possible
-*
- IF( N.LE.0 )
- $ RETURN
-*
-* Get machine parameters
-*
- SMLNUM = DLAMCH( 'S' )
- BIGNUM = ONE / SMLNUM
- CALL DLABAD( SMLNUM, BIGNUM )
-*
-* Initialize the denominator to SA and the numerator to 1.
-*
- CDEN = SA
- CNUM = ONE
-*
- 10 CONTINUE
- CDEN1 = CDEN*SMLNUM
- CNUM1 = CNUM / BIGNUM
- IF( ABS( CDEN1 ).GT.ABS( CNUM ) .AND. CNUM.NE.ZERO ) THEN
-*
-* Pre-multiply X by SMLNUM if CDEN is large compared to CNUM.
-*
- MUL = SMLNUM
- DONE = .FALSE.
- CDEN = CDEN1
- ELSE IF( ABS( CNUM1 ).GT.ABS( CDEN ) ) THEN
-*
-* Pre-multiply X by BIGNUM if CDEN is small compared to CNUM.
-*
- MUL = BIGNUM
- DONE = .FALSE.
- CNUM = CNUM1
- ELSE
-*
-* Multiply X by CNUM / CDEN and return.
-*
- MUL = CNUM / CDEN
- DONE = .TRUE.
- END IF
-*
-* Scale the vector X by MUL
-*
- CALL DSCAL( N, MUL, SX, INCX )
-*
- IF( .NOT.DONE )
- $ GO TO 10
-*
- RETURN
-*
-* End of DRSCL
-*
- END