mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
145 lines
3.5 KiB
145 lines
3.5 KiB
#include "clapack.h" |
|
|
|
/* 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 3.1) -- */ |
|
/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ |
|
/* November 2006 */ |
|
|
|
/* .. Scalar Arguments .. */ |
|
/* .. */ |
|
/* .. Array Arguments .. */ |
|
/* .. */ |
|
|
|
/* 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 */ |
|
|
|
/* ===================================================================== */ |
|
|
|
/* .. 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 DLASWP */ |
|
|
|
} /* dlaswp_ */
|
|
|