/*  -- translated by f2c (version 20100827).
   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 "f2c.h"

/* 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 3.2) --   
    -- LAPACK is a software package provided by Univ. of Tennessee,    --   
    -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--   
       November 2006   


    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 (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   

   =====================================================================   


       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_ */

