julie
be91086043
Those are just cosmetic changes to update version number and various other minor change.
121 lines
3.3 KiB
FortranFixed
121 lines
3.3 KiB
FortranFixed
SUBROUTINE DLASWP( N, A, LDA, K1, K2, IPIV, INCX )
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*
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* -- LAPACK auxiliary routine (version 3.2) --
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* -- LAPACK is a software package provided by Univ. of Tennessee, --
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* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
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* November 2006
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*
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* .. Scalar Arguments ..
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INTEGER INCX, K1, K2, LDA, N
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* ..
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* .. Array Arguments ..
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INTEGER IPIV( * )
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DOUBLE PRECISION A( LDA, * )
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* ..
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*
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* Purpose
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* =======
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*
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* DLASWP performs a series of row interchanges on the matrix A.
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* One row interchange is initiated for each of rows K1 through K2 of A.
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*
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* Arguments
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* =========
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*
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* N (input) INTEGER
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* The number of columns of the matrix A.
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*
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* A (input/output) DOUBLE PRECISION array, dimension (LDA,N)
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* On entry, the matrix of column dimension N to which the row
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* interchanges will be applied.
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* On exit, the permuted matrix.
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*
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* LDA (input) INTEGER
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* The leading dimension of the array A.
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*
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* K1 (input) INTEGER
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* The first element of IPIV for which a row interchange will
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* be done.
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*
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* K2 (input) INTEGER
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* The last element of IPIV for which a row interchange will
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* be done.
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*
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* IPIV (input) INTEGER array, dimension (K2*abs(INCX))
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* The vector of pivot indices. Only the elements in positions
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* K1 through K2 of IPIV are accessed.
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* IPIV(K) = L implies rows K and L are to be interchanged.
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*
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* INCX (input) INTEGER
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* The increment between successive values of IPIV. If IPIV
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* is negative, the pivots are applied in reverse order.
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*
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* Further Details
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* ===============
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*
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* Modified by
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* R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA
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*
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* =====================================================================
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*
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* .. Local Scalars ..
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INTEGER I, I1, I2, INC, IP, IX, IX0, J, K, N32
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DOUBLE PRECISION TEMP
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* ..
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* .. Executable Statements ..
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*
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* Interchange row I with row IPIV(I) for each of rows K1 through K2.
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*
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IF( INCX.GT.0 ) THEN
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IX0 = K1
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I1 = K1
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I2 = K2
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INC = 1
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ELSE IF( INCX.LT.0 ) THEN
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IX0 = 1 + ( 1-K2 )*INCX
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I1 = K2
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I2 = K1
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INC = -1
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ELSE
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RETURN
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END IF
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*
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N32 = ( N / 32 )*32
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IF( N32.NE.0 ) THEN
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DO 30 J = 1, N32, 32
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IX = IX0
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DO 20 I = I1, I2, INC
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IP = IPIV( IX )
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IF( IP.NE.I ) THEN
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DO 10 K = J, J + 31
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TEMP = A( I, K )
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A( I, K ) = A( IP, K )
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A( IP, K ) = TEMP
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10 CONTINUE
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END IF
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IX = IX + INCX
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20 CONTINUE
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30 CONTINUE
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END IF
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IF( N32.NE.N ) THEN
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N32 = N32 + 1
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IX = IX0
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DO 50 I = I1, I2, INC
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IP = IPIV( IX )
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IF( IP.NE.I ) THEN
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DO 40 K = N32, N
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TEMP = A( I, K )
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A( I, K ) = A( IP, K )
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A( IP, K ) = TEMP
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40 CONTINUE
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END IF
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IX = IX + INCX
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50 CONTINUE
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END IF
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*
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RETURN
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*
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* End of DLASWP
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*
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END
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