239 lines
6.1 KiB
C++
239 lines
6.1 KiB
C++
/* fortran/dlaswp.f -- translated by f2c (version 20200916).
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You must link the resulting object file with libf2c:
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on Microsoft Windows system, link with libf2c.lib;
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on Linux or Unix systems, link with .../path/to/libf2c.a -lm
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or, if you install libf2c.a in a standard place, with -lf2c -lm
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-- in that order, at the end of the command line, as in
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cc *.o -lf2c -lm
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Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
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http://www.netlib.org/f2c/libf2c.zip
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lmp_f2c.h"
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/* > \brief \b DLASWP performs a series of row interchanges on a general rectangular matrix. */
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/* =========== DOCUMENTATION =========== */
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/* Online html documentation available at */
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/* http://www.netlib.org/lapack/explore-html/ */
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/* > \htmlonly */
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/* > Download DLASWP + dependencies */
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/* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlaswp.
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f"> */
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/* > [TGZ]</a> */
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/* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlaswp.
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f"> */
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/* > [ZIP]</a> */
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/* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlaswp.
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f"> */
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/* > [TXT]</a> */
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/* > \endhtmlonly */
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/* Definition: */
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/* =========== */
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/* SUBROUTINE DLASWP( N, A, LDA, K1, K2, IPIV, INCX ) */
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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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/* > \par Purpose: */
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/* ============= */
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/* > */
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/* > \verbatim */
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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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/* > \endverbatim */
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/* Arguments: */
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/* ========== */
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/* > \param[in] N */
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/* > \verbatim */
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/* > N is INTEGER */
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/* > The number of columns of the matrix A. */
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/* > \endverbatim */
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/* > */
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/* > \param[in,out] A */
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/* > \verbatim */
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/* > A is 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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/* > \endverbatim */
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/* > */
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/* > \param[in] LDA */
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/* > \verbatim */
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/* > LDA is INTEGER */
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/* > The leading dimension of the array A. */
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/* > \endverbatim */
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/* > */
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/* > \param[in] K1 */
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/* > \verbatim */
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/* > K1 is 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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/* > \endverbatim */
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/* > */
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/* > \param[in] K2 */
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/* > \verbatim */
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/* > K2 is INTEGER */
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/* > (K2-K1+1) is the number of elements of IPIV for which a row */
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/* > interchange will be done. */
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/* > \endverbatim */
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/* > */
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/* > \param[in] IPIV */
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/* > \verbatim */
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/* > IPIV is INTEGER array, dimension (K1+(K2-K1)*abs(INCX)) */
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/* > The vector of pivot indices. Only the elements in positions */
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/* > K1 through K1+(K2-K1)*abs(INCX) of IPIV are accessed. */
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/* > IPIV(K1+(K-K1)*abs(INCX)) = L implies rows K and L are to be */
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/* > interchanged. */
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/* > \endverbatim */
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/* > */
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/* > \param[in] INCX */
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/* > \verbatim */
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/* > INCX is INTEGER */
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/* > The increment between successive values of IPIV. If INCX */
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/* > is negative, the pivots are applied in reverse order. */
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/* > \endverbatim */
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/* Authors: */
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/* ======== */
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/* > \author Univ. of Tennessee */
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/* > \author Univ. of California Berkeley */
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/* > \author Univ. of Colorado Denver */
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/* > \author NAG Ltd. */
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/* > \ingroup doubleOTHERauxiliary */
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/* > \par Further Details: */
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/* ===================== */
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/* > */
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/* > \verbatim */
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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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/* > \endverbatim */
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/* > */
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/* ===================================================================== */
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/* Subroutine */ int dlaswp_(integer *n, doublereal *a, integer *lda, integer
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*k1, integer *k2, integer *ipiv, integer *incx)
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{
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/* System generated locals */
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integer a_dim1, a_offset, i__1, i__2, i__3, i__4;
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/* Local variables */
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integer i__, j, k, i1, i2, n32, ip, ix, ix0, inc;
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doublereal temp;
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/* -- LAPACK auxiliary routine -- */
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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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/* .. Scalar Arguments .. */
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/* .. */
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/* .. Array Arguments .. */
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/* .. */
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/* ===================================================================== */
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/* .. Local Scalars .. */
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/* .. */
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/* .. Executable Statements .. */
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/* Interchange row I with row IPIV(K1+(I-K1)*abs(INCX)) for each of rows */
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/* K1 through K2. */
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/* Parameter adjustments */
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a_dim1 = *lda;
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a_offset = 1 + a_dim1;
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a -= a_offset;
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--ipiv;
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/* Function Body */
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if (*incx > 0) {
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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 < 0) {
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ix0 = *k1 + (*k1 - *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 0;
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}
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n32 = *n / 32 << 5;
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if (n32 != 0) {
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i__1 = n32;
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for (j = 1; j <= i__1; j += 32) {
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ix = ix0;
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i__2 = i2;
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i__3 = inc;
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for (i__ = i1; i__3 < 0 ? i__ >= i__2 : i__ <= i__2; i__ += i__3)
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{
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ip = ipiv[ix];
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if (ip != i__) {
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i__4 = j + 31;
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for (k = j; k <= i__4; ++k) {
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temp = a[i__ + k * a_dim1];
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a[i__ + k * a_dim1] = a[ip + k * a_dim1];
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a[ip + k * a_dim1] = temp;
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/* L10: */
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}
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}
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ix += *incx;
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/* L20: */
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}
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/* L30: */
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}
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}
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if (n32 != *n) {
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++n32;
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ix = ix0;
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i__1 = i2;
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i__3 = inc;
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for (i__ = i1; i__3 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__3) {
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ip = ipiv[ix];
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if (ip != i__) {
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i__2 = *n;
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for (k = n32; k <= i__2; ++k) {
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temp = a[i__ + k * a_dim1];
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a[i__ + k * a_dim1] = a[ip + k * a_dim1];
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a[ip + k * a_dim1] = temp;
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/* L40: */
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}
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}
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ix += *incx;
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/* L50: */
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}
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}
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return 0;
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/* End of DLASWP */
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} /* dlaswp_ */
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#ifdef __cplusplus
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}
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#endif
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