--- /dev/null
+#include "clapack.h"
+
+/* Table of constant values */
+
+static integer c__1 = 1;
+static integer c_n1 = -1;
+static integer c__2 = 2;
+
+/* Subroutine */ int dormtr_(char *side, char *uplo, char *trans, integer *m,
+ integer *n, doublereal *a, integer *lda, doublereal *tau, doublereal *
+ c__, integer *ldc, doublereal *work, integer *lwork, integer *info)
+{
+ /* System generated locals */
+ address a__1[2];
+ integer a_dim1, a_offset, c_dim1, c_offset, i__1[2], i__2, i__3;
+ char ch__1[2];
+
+ /* Builtin functions */
+ /* Subroutine */ int s_cat(char *, char **, integer *, integer *, ftnlen);
+
+ /* Local variables */
+ integer i1, i2, nb, mi, ni, nq, nw;
+ logical left;
+ extern logical lsame_(char *, char *);
+ integer iinfo;
+ logical upper;
+ extern /* Subroutine */ int xerbla_(char *, integer *);
+ extern integer ilaenv_(integer *, char *, char *, integer *, integer *,
+ integer *, integer *);
+ extern /* Subroutine */ int dormql_(char *, char *, integer *, integer *,
+ integer *, doublereal *, integer *, doublereal *, doublereal *,
+ integer *, doublereal *, integer *, integer *),
+ dormqr_(char *, char *, integer *, integer *, integer *,
+ doublereal *, integer *, doublereal *, doublereal *, integer *,
+ doublereal *, integer *, integer *);
+ integer lwkopt;
+ logical lquery;
+
+
+/* -- LAPACK routine (version 3.1) -- */
+/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
+/* November 2006 */
+
+/* .. Scalar Arguments .. */
+/* .. */
+/* .. Array Arguments .. */
+/* .. */
+
+/* Purpose */
+/* ======= */
+
+/* DORMTR overwrites the general real M-by-N matrix C with */
+
+/* SIDE = 'L' SIDE = 'R' */
+/* TRANS = 'N': Q * C C * Q */
+/* TRANS = 'T': Q**T * C C * Q**T */
+
+/* where Q is a real orthogonal matrix of order nq, with nq = m if */
+/* SIDE = 'L' and nq = n if SIDE = 'R'. Q is defined as the product of */
+/* nq-1 elementary reflectors, as returned by DSYTRD: */
+
+/* if UPLO = 'U', Q = H(nq-1) . . . H(2) H(1); */
+
+/* if UPLO = 'L', Q = H(1) H(2) . . . H(nq-1). */
+
+/* Arguments */
+/* ========= */
+
+/* SIDE (input) CHARACTER*1 */
+/* = 'L': apply Q or Q**T from the Left; */
+/* = 'R': apply Q or Q**T from the Right. */
+
+/* UPLO (input) CHARACTER*1 */
+/* = 'U': Upper triangle of A contains elementary reflectors */
+/* from DSYTRD; */
+/* = 'L': Lower triangle of A contains elementary reflectors */
+/* from DSYTRD. */
+
+/* TRANS (input) CHARACTER*1 */
+/* = 'N': No transpose, apply Q; */
+/* = 'T': Transpose, apply Q**T. */
+
+/* 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. */
+
+/* A (input) DOUBLE PRECISION array, dimension */
+/* (LDA,M) if SIDE = 'L' */
+/* (LDA,N) if SIDE = 'R' */
+/* The vectors which define the elementary reflectors, as */
+/* returned by DSYTRD. */
+
+/* LDA (input) INTEGER */
+/* The leading dimension of the array A. */
+/* LDA >= max(1,M) if SIDE = 'L'; LDA >= max(1,N) if SIDE = 'R'. */
+
+/* TAU (input) DOUBLE PRECISION array, dimension */
+/* (M-1) if SIDE = 'L' */
+/* (N-1) if SIDE = 'R' */
+/* TAU(i) must contain the scalar factor of the elementary */
+/* reflector H(i), as returned by DSYTRD. */
+
+/* C (input/output) DOUBLE PRECISION array, dimension (LDC,N) */
+/* On entry, the M-by-N matrix C. */
+/* On exit, C is overwritten by Q*C or Q**T*C or C*Q**T or C*Q. */
+
+/* LDC (input) INTEGER */
+/* The leading dimension of the array C. LDC >= max(1,M). */
+
+/* WORK (workspace/output) DOUBLE PRECISION array, dimension (MAX(1,LWORK)) */
+/* On exit, if INFO = 0, WORK(1) returns the optimal LWORK. */
+
+/* LWORK (input) INTEGER */
+/* The dimension of the array WORK. */
+/* If SIDE = 'L', LWORK >= max(1,N); */
+/* if SIDE = 'R', LWORK >= max(1,M). */
+/* For optimum performance LWORK >= N*NB if SIDE = 'L', and */
+/* LWORK >= M*NB if SIDE = 'R', where NB is the optimal */
+/* blocksize. */
+
+/* If LWORK = -1, then a workspace query is assumed; the routine */
+/* only calculates the optimal size of the WORK array, returns */
+/* this value as the first entry of the WORK array, and no error */
+/* message related to LWORK is issued by XERBLA. */
+
+/* INFO (output) INTEGER */
+/* = 0: successful exit */
+/* < 0: if INFO = -i, the i-th argument had an illegal value */
+
+/* ===================================================================== */
+
+/* .. 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");
+ upper = lsame_(uplo, "U");
+ lquery = *lwork == -1;
+
+/* NQ is the order of Q and NW is the minimum dimension of WORK */
+
+ if (left) {
+ nq = *m;
+ nw = *n;
+ } else {
+ nq = *n;
+ nw = *m;
+ }
+ if (! left && ! lsame_(side, "R")) {
+ *info = -1;
+ } else if (! upper && ! lsame_(uplo, "L")) {
+ *info = -2;
+ } else if (! lsame_(trans, "N") && ! lsame_(trans,
+ "T")) {
+ *info = -3;
+ } else if (*m < 0) {
+ *info = -4;
+ } else if (*n < 0) {
+ *info = -5;
+ } else if (*lda < max(1,nq)) {
+ *info = -7;
+ } else if (*ldc < max(1,*m)) {
+ *info = -10;
+ } else if (*lwork < max(1,nw) && ! lquery) {
+ *info = -12;
+ }
+
+ if (*info == 0) {
+ if (upper) {
+ if (left) {
+/* Writing concatenation */
+ i__1[0] = 1, a__1[0] = side;
+ i__1[1] = 1, a__1[1] = trans;
+ s_cat(ch__1, a__1, i__1, &c__2, (ftnlen)2);
+ i__2 = *m - 1;
+ i__3 = *m - 1;
+ nb = ilaenv_(&c__1, "DORMQL", ch__1, &i__2, n, &i__3, &c_n1);
+ } else {
+/* Writing concatenation */
+ i__1[0] = 1, a__1[0] = side;
+ i__1[1] = 1, a__1[1] = trans;
+ s_cat(ch__1, a__1, i__1, &c__2, (ftnlen)2);
+ i__2 = *n - 1;
+ i__3 = *n - 1;
+ nb = ilaenv_(&c__1, "DORMQL", ch__1, m, &i__2, &i__3, &c_n1);
+ }
+ } else {
+ if (left) {
+/* Writing concatenation */
+ i__1[0] = 1, a__1[0] = side;
+ i__1[1] = 1, a__1[1] = trans;
+ s_cat(ch__1, a__1, i__1, &c__2, (ftnlen)2);
+ i__2 = *m - 1;
+ i__3 = *m - 1;
+ nb = ilaenv_(&c__1, "DORMQR", ch__1, &i__2, n, &i__3, &c_n1);
+ } else {
+/* Writing concatenation */
+ i__1[0] = 1, a__1[0] = side;
+ i__1[1] = 1, a__1[1] = trans;
+ s_cat(ch__1, a__1, i__1, &c__2, (ftnlen)2);
+ i__2 = *n - 1;
+ i__3 = *n - 1;
+ nb = ilaenv_(&c__1, "DORMQR", ch__1, m, &i__2, &i__3, &c_n1);
+ }
+ }
+ lwkopt = max(1,nw) * nb;
+ work[1] = (doublereal) lwkopt;
+ }
+
+ if (*info != 0) {
+ i__2 = -(*info);
+ xerbla_("DORMTR", &i__2);
+ return 0;
+ } else if (lquery) {
+ return 0;
+ }
+
+/* Quick return if possible */
+
+ if (*m == 0 || *n == 0 || nq == 1) {
+ work[1] = 1.;
+ return 0;
+ }
+
+ if (left) {
+ mi = *m - 1;
+ ni = *n;
+ } else {
+ mi = *m;
+ ni = *n - 1;
+ }
+
+ if (upper) {
+
+/* Q was determined by a call to DSYTRD with UPLO = 'U' */
+
+ i__2 = nq - 1;
+ dormql_(side, trans, &mi, &ni, &i__2, &a[(a_dim1 << 1) + 1], lda, &
+ tau[1], &c__[c_offset], ldc, &work[1], lwork, &iinfo);
+ } else {
+
+/* Q was determined by a call to DSYTRD with UPLO = 'L' */
+
+ if (left) {
+ i1 = 2;
+ i2 = 1;
+ } else {
+ i1 = 1;
+ i2 = 2;
+ }
+ i__2 = nq - 1;
+ dormqr_(side, trans, &mi, &ni, &i__2, &a[a_dim1 + 2], lda, &tau[1], &
+ c__[i1 + i2 * c_dim1], ldc, &work[1], lwork, &iinfo);
+ }
+ work[1] = (doublereal) lwkopt;
+ return 0;
+
+/* End of DORMTR */
+
+} /* dormtr_ */
projects / opencv / blobdiff