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*/
#include "f2c.h"
/* > \brief \b DLASWP performs a series of row interchanges on a general rectangular matrix.
=========== DOCUMENTATION ===========
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http://www.netlib.org/lapack/explore-html/
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Definition:
===========
SUBROUTINE DLASWP( N, A, LDA, K1, K2, IPIV, INCX )
INTEGER INCX, K1, K2, LDA, N
INTEGER IPIV( * )
DOUBLE PRECISION A( LDA, * )
> \par Purpose:
=============
>
> \verbatim
>
> DLASWP performs a series of row interchanges on the matrix A.
> One row interchange is initiated for each of rows K1 through K2 of A.
> \endverbatim
Arguments:
==========
> \param[in] N
> \verbatim
> N is INTEGER
> The number of columns of the matrix A.
> \endverbatim
>
> \param[in,out] A
> \verbatim
> A is DOUBLE PRECISION array, dimension (LDA,N)
> On entry, the matrix of column dimension N to which the row
> interchanges will be applied.
> On exit, the permuted matrix.
> \endverbatim
>
> \param[in] LDA
> \verbatim
> LDA is INTEGER
> The leading dimension of the array A.
> \endverbatim
>
> \param[in] K1
> \verbatim
> K1 is INTEGER
> The first element of IPIV for which a row interchange will
> be done.
> \endverbatim
>
> \param[in] K2
> \verbatim
> K2 is INTEGER
> The last element of IPIV for which a row interchange will
> be done.
> \endverbatim
>
> \param[in] IPIV
> \verbatim
> IPIV is INTEGER array, dimension (K2*abs(INCX))
> The vector of pivot indices. Only the elements in positions
> K1 through K2 of IPIV are accessed.
> IPIV(K) = L implies rows K and L are to be interchanged.
> \endverbatim
>
> \param[in] INCX
> \verbatim
> INCX is INTEGER
> The increment between successive values of IPIV. If IPIV
> is negative, the pivots are applied in reverse order.
> \endverbatim
Authors:
========
> \author Univ. of Tennessee
> \author Univ. of California Berkeley
> \author Univ. of Colorado Denver
> \author NAG Ltd.
> \date September 2012
> \ingroup doubleOTHERauxiliary
> \par Further Details:
=====================
>
> \verbatim
>
> Modified by
> R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA
> \endverbatim
>
=====================================================================
Subroutine */ int igraphdlaswp_(integer *n, doublereal *a, integer *lda, integer
*k1, integer *k2, integer *ipiv, integer *incx)
{
/* System generated locals */
integer a_dim1, a_offset, i__1, i__2, i__3, i__4;
/* Local variables */
integer i__, j, k, i1, i2, n32, ip, ix, ix0, inc;
doublereal temp;
/* -- LAPACK auxiliary routine (version 3.4.2) --
-- LAPACK is a software package provided by Univ. of Tennessee, --
-- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
September 2012
=====================================================================
Interchange row I with row IPIV(I) for each of rows K1 through K2.
Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1;
a -= a_offset;
--ipiv;
/* Function Body */
if (*incx > 0) {
ix0 = *k1;
i1 = *k1;
i2 = *k2;
inc = 1;
} else if (*incx < 0) {
ix0 = (1 - *k2) * *incx + 1;
i1 = *k2;
i2 = *k1;
inc = -1;
} else {
return 0;
}
n32 = *n / 32 << 5;
if (n32 != 0) {
i__1 = n32;
for (j = 1; j <= i__1; j += 32) {
ix = ix0;
i__2 = i2;
i__3 = inc;
for (i__ = i1; i__3 < 0 ? i__ >= i__2 : i__ <= i__2; i__ += i__3)
{
ip = ipiv[ix];
if (ip != i__) {
i__4 = j + 31;
for (k = j; k <= i__4; ++k) {
temp = a[i__ + k * a_dim1];
a[i__ + k * a_dim1] = a[ip + k * a_dim1];
a[ip + k * a_dim1] = temp;
/* L10: */
}
}
ix += *incx;
/* L20: */
}
/* L30: */
}
}
if (n32 != *n) {
++n32;
ix = ix0;
i__1 = i2;
i__3 = inc;
for (i__ = i1; i__3 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__3) {
ip = ipiv[ix];
if (ip != i__) {
i__2 = *n;
for (k = n32; k <= i__2; ++k) {
temp = a[i__ + k * a_dim1];
a[i__ + k * a_dim1] = a[ip + k * a_dim1];
a[ip + k * a_dim1] = temp;
/* L40: */
}
}
ix += *incx;
/* L50: */
}
}
return 0;
/* End of DLASWP */
} /* igraphdlaswp_ */