159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
/* slaswp.f -- translated by f2c (version 20061008).
|
|
You must link the resulting object file with libf2c:
|
|
on Microsoft Windows system, link with libf2c.lib;
|
|
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
|
|
or, if you install libf2c.a in a standard place, with -lf2c -lm
|
|
-- in that order, at the end of the command line, as in
|
|
cc *.o -lf2c -lm
|
|
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
|
|
|
|
http://www.netlib.org/f2c/libf2c.zip
|
|
*/
|
|
|
|
#include "clapack.h"
|
|
|
|
|
|
/* Subroutine */ int slaswp_(integer *n, real *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;
|
|
real temp;
|
|
|
|
|
|
/* -- LAPACK auxiliary routine (version 3.2) -- */
|
|
/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
|
|
/* November 2006 */
|
|
|
|
/* .. Scalar Arguments .. */
|
|
/* .. */
|
|
/* .. Array Arguments .. */
|
|
/* .. */
|
|
|
|
/* Purpose */
|
|
/* ======= */
|
|
|
|
/* SLASWP performs a series of row interchanges on the matrix A. */
|
|
/* One row interchange is initiated for each of rows K1 through K2 of A. */
|
|
|
|
/* Arguments */
|
|
/* ========= */
|
|
|
|
/* N (input) INTEGER */
|
|
/* The number of columns of the matrix A. */
|
|
|
|
/* A (input/output) REAL 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. */
|
|
|
|
/* LDA (input) INTEGER */
|
|
/* The leading dimension of the array A. */
|
|
|
|
/* K1 (input) INTEGER */
|
|
/* The first element of IPIV for which a row interchange will */
|
|
/* be done. */
|
|
|
|
/* K2 (input) INTEGER */
|
|
/* The last element of IPIV for which a row interchange will */
|
|
/* be done. */
|
|
|
|
/* IPIV (input) 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. */
|
|
|
|
/* INCX (input) INTEGER */
|
|
/* The increment between successive values of IPIV. If IPIV */
|
|
/* is negative, the pivots are applied in reverse order. */
|
|
|
|
/* Further Details */
|
|
/* =============== */
|
|
|
|
/* Modified by */
|
|
/* R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA */
|
|
|
|
/* ===================================================================== */
|
|
|
|
/* .. Local Scalars .. */
|
|
/* .. */
|
|
/* .. Executable Statements .. */
|
|
|
|
/* 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 SLASWP */
|
|
|
|
} /* slaswp_ */
|