--- /dev/null
+#include "clapack.h"
+
+/* Table of constant values */
+
+static integer c__1 = 1;
+
+/* Subroutine */ int sorm2l_(char *side, char *trans, integer *m, integer *n,
+ integer *k, real *a, integer *lda, real *tau, real *c__, integer *ldc,
+ real *work, integer *info)
+{
+ /* System generated locals */
+ integer a_dim1, a_offset, c_dim1, c_offset, i__1, i__2;
+
+ /* Local variables */
+ integer i__, i1, i2, i3, mi, ni, nq;
+ real aii;
+ logical left;
+ extern logical lsame_(char *, char *);
+ extern /* Subroutine */ int slarf_(char *, integer *, integer *, real *,
+ integer *, real *, real *, integer *, real *), xerbla_(
+ char *, integer *);
+ logical notran;
+
+
+/* -- LAPACK routine (version 3.1) -- */
+/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
+/* November 2006 */
+
+/* .. Scalar Arguments .. */
+/* .. */
+/* .. Array Arguments .. */
+/* .. */
+
+/* Purpose */
+/* ======= */
+
+/* SORM2L overwrites the general real m by n matrix C with */
+
+/* Q * C if SIDE = 'L' and TRANS = 'N', or */
+
+/* Q'* C if SIDE = 'L' and TRANS = 'T', or */
+
+/* C * Q if SIDE = 'R' and TRANS = 'N', or */
+
+/* C * Q' if SIDE = 'R' and TRANS = 'T', */
+
+/* where Q is a real orthogonal matrix defined as the product of k */
+/* elementary reflectors */
+
+/* Q = H(k) . . . H(2) H(1) */
+
+/* as returned by SGEQLF. Q is of order m if SIDE = 'L' and of order n */
+/* if SIDE = 'R'. */
+
+/* Arguments */
+/* ========= */
+
+/* SIDE (input) CHARACTER*1 */
+/* = 'L': apply Q or Q' from the Left */
+/* = 'R': apply Q or Q' from the Right */
+
+/* TRANS (input) CHARACTER*1 */
+/* = 'N': apply Q (No transpose) */
+/* = 'T': apply Q' (Transpose) */
+
+/* M (input) INTEGER */
+/* The number of rows of the matrix C. M >= 0. */
+
+/* N (input) INTEGER */
+/* The number of columns of the matrix C. N >= 0. */
+
+/* K (input) INTEGER */
+/* The number of elementary reflectors whose product defines */
+/* the matrix Q. */
+/* If SIDE = 'L', M >= K >= 0; */
+/* if SIDE = 'R', N >= K >= 0. */
+
+/* A (input) REAL array, dimension (LDA,K) */
+/* The i-th column must contain the vector which defines the */
+/* elementary reflector H(i), for i = 1,2,...,k, as returned by */
+/* SGEQLF in the last k columns of its array argument A. */
+/* A is modified by the routine but restored on exit. */
+
+/* LDA (input) INTEGER */
+/* The leading dimension of the array A. */
+/* If SIDE = 'L', LDA >= max(1,M); */
+/* if SIDE = 'R', LDA >= max(1,N). */
+
+/* TAU (input) REAL array, dimension (K) */
+/* TAU(i) must contain the scalar factor of the elementary */
+/* reflector H(i), as returned by SGEQLF. */
+
+/* C (input/output) REAL array, dimension (LDC,N) */
+/* On entry, the m by n matrix C. */
+/* On exit, C is overwritten by Q*C or Q'*C or C*Q' or C*Q. */
+
+/* LDC (input) INTEGER */
+/* The leading dimension of the array C. LDC >= max(1,M). */
+
+/* WORK (workspace) REAL array, dimension */
+/* (N) if SIDE = 'L', */
+/* (M) if SIDE = 'R' */
+
+/* INFO (output) INTEGER */
+/* = 0: successful exit */
+/* < 0: if INFO = -i, the i-th argument had an illegal value */
+
+/* ===================================================================== */
+
+/* .. Parameters .. */
+/* .. */
+/* .. Local Scalars .. */
+/* .. */
+/* .. External Functions .. */
+/* .. */
+/* .. External Subroutines .. */
+/* .. */
+/* .. Intrinsic Functions .. */
+/* .. */
+/* .. Executable Statements .. */
+
+/* Test the input arguments */
+
+ /* Parameter adjustments */
+ a_dim1 = *lda;
+ a_offset = 1 + a_dim1;
+ a -= a_offset;
+ --tau;
+ c_dim1 = *ldc;
+ c_offset = 1 + c_dim1;
+ c__ -= c_offset;
+ --work;
+
+ /* Function Body */
+ *info = 0;
+ left = lsame_(side, "L");
+ notran = lsame_(trans, "N");
+
+/* NQ is the order of Q */
+
+ if (left) {
+ nq = *m;
+ } else {
+ nq = *n;
+ }
+ if (! left && ! lsame_(side, "R")) {
+ *info = -1;
+ } else if (! notran && ! lsame_(trans, "T")) {
+ *info = -2;
+ } else if (*m < 0) {
+ *info = -3;
+ } else if (*n < 0) {
+ *info = -4;
+ } else if (*k < 0 || *k > nq) {
+ *info = -5;
+ } else if (*lda < max(1,nq)) {
+ *info = -7;
+ } else if (*ldc < max(1,*m)) {
+ *info = -10;
+ }
+ if (*info != 0) {
+ i__1 = -(*info);
+ xerbla_("SORM2L", &i__1);
+ return 0;
+ }
+
+/* Quick return if possible */
+
+ if (*m == 0 || *n == 0 || *k == 0) {
+ return 0;
+ }
+
+ if (left && notran || ! left && ! notran) {
+ i1 = 1;
+ i2 = *k;
+ i3 = 1;
+ } else {
+ i1 = *k;
+ i2 = 1;
+ i3 = -1;
+ }
+
+ if (left) {
+ ni = *n;
+ } else {
+ mi = *m;
+ }
+
+ i__1 = i2;
+ i__2 = i3;
+ for (i__ = i1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
+ if (left) {
+
+/* H(i) is applied to C(1:m-k+i,1:n) */
+
+ mi = *m - *k + i__;
+ } else {
+
+/* H(i) is applied to C(1:m,1:n-k+i) */
+
+ ni = *n - *k + i__;
+ }
+
+/* Apply H(i) */
+
+ aii = a[nq - *k + i__ + i__ * a_dim1];
+ a[nq - *k + i__ + i__ * a_dim1] = 1.f;
+ slarf_(side, &mi, &ni, &a[i__ * a_dim1 + 1], &c__1, &tau[i__], &c__[
+ c_offset], ldc, &work[1]);
+ a[nq - *k + i__ + i__ * a_dim1] = aii;
+/* L10: */
+ }
+ return 0;
+
+/* End of SORM2L */
+
+} /* sorm2l_ */
projects / opencv / blobdiff