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SUBROUTINE <a name="ZLASWP.1"></a><a href="zlaswp.f.html#ZLASWP.1">ZLASWP</a>( N, A, LDA, K1, K2, IPIV, INCX )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> -- LAPACK auxiliary routine (version 3.1) --
</span><span class="comment">*</span><span class="comment"> Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
</span><span class="comment">*</span><span class="comment"> November 2006
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> .. Scalar Arguments ..
</span> INTEGER INCX, K1, K2, LDA, N
<span class="comment">*</span><span class="comment"> ..
</span><span class="comment">*</span><span class="comment"> .. Array Arguments ..
</span> INTEGER IPIV( * )
COMPLEX*16 A( LDA, * )
<span class="comment">*</span><span class="comment"> ..
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Purpose
</span><span class="comment">*</span><span class="comment"> =======
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> <a name="ZLASWP.18"></a><a href="zlaswp.f.html#ZLASWP.1">ZLASWP</a> performs a series of row interchanges on the matrix A.
</span><span class="comment">*</span><span class="comment"> One row interchange is initiated for each of rows K1 through K2 of A.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Arguments
</span><span class="comment">*</span><span class="comment"> =========
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> N (input) INTEGER
</span><span class="comment">*</span><span class="comment"> The number of columns of the matrix A.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> A (input/output) COMPLEX*16 array, dimension (LDA,N)
</span><span class="comment">*</span><span class="comment"> On entry, the matrix of column dimension N to which the row
</span><span class="comment">*</span><span class="comment"> interchanges will be applied.
</span><span class="comment">*</span><span class="comment"> On exit, the permuted matrix.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> LDA (input) INTEGER
</span><span class="comment">*</span><span class="comment"> The leading dimension of the array A.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> K1 (input) INTEGER
</span><span class="comment">*</span><span class="comment"> The first element of IPIV for which a row interchange will
</span><span class="comment">*</span><span class="comment"> be done.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> K2 (input) INTEGER
</span><span class="comment">*</span><span class="comment"> The last element of IPIV for which a row interchange will
</span><span class="comment">*</span><span class="comment"> be done.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> IPIV (input) INTEGER array, dimension (K2*abs(INCX))
</span><span class="comment">*</span><span class="comment"> The vector of pivot indices. Only the elements in positions
</span><span class="comment">*</span><span class="comment"> K1 through K2 of IPIV are accessed.
</span><span class="comment">*</span><span class="comment"> IPIV(K) = L implies rows K and L are to be interchanged.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> INCX (input) INTEGER
</span><span class="comment">*</span><span class="comment"> The increment between successive values of IPIV. If IPIV
</span><span class="comment">*</span><span class="comment"> is negative, the pivots are applied in reverse order.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Further Details
</span><span class="comment">*</span><span class="comment"> ===============
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Modified by
</span><span class="comment">*</span><span class="comment"> R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> =====================================================================
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> .. Local Scalars ..
</span> INTEGER I, I1, I2, INC, IP, IX, IX0, J, K, N32
COMPLEX*16 TEMP
<span class="comment">*</span><span class="comment"> ..
</span><span class="comment">*</span><span class="comment"> .. Executable Statements ..
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> Interchange row I with row IPIV(I) for each of rows K1 through K2.
</span><span class="comment">*</span><span class="comment">
</span> IF( INCX.GT.0 ) THEN
IX0 = K1
I1 = K1
I2 = K2
INC = 1
ELSE IF( INCX.LT.0 ) THEN
IX0 = 1 + ( 1-K2 )*INCX
I1 = K2
I2 = K1
INC = -1
ELSE
RETURN
END IF
<span class="comment">*</span><span class="comment">
</span> N32 = ( N / 32 )*32
IF( N32.NE.0 ) THEN
DO 30 J = 1, N32, 32
IX = IX0
DO 20 I = I1, I2, INC
IP = IPIV( IX )
IF( IP.NE.I ) THEN
DO 10 K = J, J + 31
TEMP = A( I, K )
A( I, K ) = A( IP, K )
A( IP, K ) = TEMP
10 CONTINUE
END IF
IX = IX + INCX
20 CONTINUE
30 CONTINUE
END IF
IF( N32.NE.N ) THEN
N32 = N32 + 1
IX = IX0
DO 50 I = I1, I2, INC
IP = IPIV( IX )
IF( IP.NE.I ) THEN
DO 40 K = N32, N
TEMP = A( I, K )
A( I, K ) = A( IP, K )
A( IP, K ) = TEMP
40 CONTINUE
END IF
IX = IX + INCX
50 CONTINUE
END IF
<span class="comment">*</span><span class="comment">
</span> RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment"> End of <a name="ZLASWP.117"></a><a href="zlaswp.f.html#ZLASWP.1">ZLASWP</a>
</span><span class="comment">*</span><span class="comment">
</span> END
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