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/* lapack/double/dlaswp.f -- translated by f2c (version 20050501).
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
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "v3p_netlib.h"
/*< SUBROUTINE DLASWP( N, A, LDA, K1, K2, IPIV, INCX ) >*/
/* Subroutine */ int dlaswp_(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 3.0) -- */
/* Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd., */
/* Courant Institute, Argonne National Lab, and Rice University */
/* June 30, 1999 */
/* .. Scalar Arguments .. */
/*< INTEGER INCX, K1, K2, LDA, N >*/
/* .. */
/* .. Array Arguments .. */
/*< INTEGER IPIV( * ) >*/
/*< DOUBLE PRECISION A( LDA, * ) >*/
/* .. */
/* Purpose */
/* ======= */
/* 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. */
/* Arguments */
/* ========= */
/* N (input) INTEGER */
/* The number of columns of the matrix A. */
/* A (input/output) 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. */
/* 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 (M*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 .. */
/*< INTEGER I, I1, I2, INC, IP, IX, IX0, J, K, N32 >*/
/*< DOUBLE PRECISION TEMP >*/
/* .. */
/* .. Executable Statements .. */
/* Interchange row I with row IPIV(I) for each of rows K1 through K2. */
/*< IF( INCX.GT.0 ) THEN >*/
/* Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1;
a -= a_offset;
--ipiv;
/* Function Body */
if (*incx > 0) {
/*< IX0 = K1 >*/
ix0 = *k1;
/*< I1 = K1 >*/
i1 = *k1;
/*< I2 = K2 >*/
i2 = *k2;
/*< INC = 1 >*/
inc = 1;
/*< ELSE IF( INCX.LT.0 ) THEN >*/
} else if (*incx < 0) {
/*< IX0 = 1 + ( 1-K2 )*INCX >*/
ix0 = (1 - *k2) * *incx + 1;
/*< I1 = K2 >*/
i1 = *k2;
/*< I2 = K1 >*/
i2 = *k1;
/*< INC = -1 >*/
inc = -1;
/*< ELSE >*/
} else {
/*< RETURN >*/
return 0;
/*< END IF >*/
}
/*< N32 = ( N / 32 )*32 >*/
n32 = *n / 32 << 5;
/*< IF( N32.NE.0 ) THEN >*/
if (n32 != 0) {
/*< DO 30 J = 1, N32, 32 >*/
i__1 = n32;
for (j = 1; j <= i__1; j += 32) {
/*< IX = IX0 >*/
ix = ix0;
/*< DO 20 I = I1, I2, INC >*/
i__2 = i2;
i__3 = inc;
for (i__ = i1; i__3 < 0 ? i__ >= i__2 : i__ <= i__2; i__ += i__3)
{
/*< IP = IPIV( IX ) >*/
ip = ipiv[ix];
/*< IF( IP.NE.I ) THEN >*/
if (ip != i__) {
/*< DO 10 K = J, J + 31 >*/
i__4 = j + 31;
for (k = j; k <= i__4; ++k) {
/*< TEMP = A( I, K ) >*/
temp = a[i__ + k * a_dim1];
/*< A( I, K ) = A( IP, K ) >*/
a[i__ + k * a_dim1] = a[ip + k * a_dim1];
/*< A( IP, K ) = TEMP >*/
a[ip + k * a_dim1] = temp;
/*< 10 CONTINUE >*/
/* L10: */
}
/*< END IF >*/
}
/*< IX = IX + INCX >*/
ix += *incx;
/*< 20 CONTINUE >*/
/* L20: */
}
/*< 30 CONTINUE >*/
/* L30: */
}
/*< END IF >*/
}
/*< IF( N32.NE.N ) THEN >*/
if (n32 != *n) {
/*< N32 = N32 + 1 >*/
++n32;
/*< IX = IX0 >*/
ix = ix0;
/*< DO 50 I = I1, I2, INC >*/
i__1 = i2;
i__3 = inc;
for (i__ = i1; i__3 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__3) {
/*< IP = IPIV( IX ) >*/
ip = ipiv[ix];
/*< IF( IP.NE.I ) THEN >*/
if (ip != i__) {
/*< DO 40 K = N32, N >*/
i__2 = *n;
for (k = n32; k <= i__2; ++k) {
/*< TEMP = A( I, K ) >*/
temp = a[i__ + k * a_dim1];
/*< A( I, K ) = A( IP, K ) >*/
a[i__ + k * a_dim1] = a[ip + k * a_dim1];
/*< A( IP, K ) = TEMP >*/
a[ip + k * a_dim1] = temp;
/*< 40 CONTINUE >*/
/* L40: */
}
/*< END IF >*/
}
/*< IX = IX + INCX >*/
ix += *incx;
/*< 50 CONTINUE >*/
/* L50: */
}
/*< END IF >*/
}
/*< RETURN >*/
return 0;
/* End of DLASWP */
/*< END >*/
} /* dlaswp_ */
#ifdef __cplusplus
}
#endif
|
