113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lmp_f2c.h"
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static integer c__1 = 1;
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static integer c_n1 = -1;
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static integer c__3 = 3;
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static integer c__2 = 2;
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int dgelqf_(integer *m, integer *n, doublereal *a, integer *lda, doublereal *tau, doublereal *work,
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integer *lwork, integer *info)
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{
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integer a_dim1, a_offset, i__1, i__2, i__3, i__4;
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integer i__, k, ib, nb, nx, iws, nbmin, iinfo;
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extern int dgelq2_(integer *, integer *, doublereal *, integer *, doublereal *, doublereal *,
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integer *),
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dlarfb_(char *, char *, char *, char *, integer *, integer *, integer *, doublereal *,
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integer *, doublereal *, integer *, doublereal *, integer *, doublereal *,
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integer *, ftnlen, ftnlen, ftnlen, ftnlen),
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dlarft_(char *, char *, integer *, integer *, doublereal *, integer *, doublereal *,
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doublereal *, integer *, ftnlen, ftnlen),
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xerbla_(char *, integer *, ftnlen);
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extern integer ilaenv_(integer *, char *, char *, integer *, integer *, integer *, integer *,
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ftnlen, ftnlen);
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integer ldwork, lwkopt;
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logical lquery;
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a_dim1 = *lda;
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a_offset = 1 + a_dim1;
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a -= a_offset;
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--tau;
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--work;
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*info = 0;
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k = min(*m, *n);
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nb = ilaenv_(&c__1, (char *)"DGELQF", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
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lquery = *lwork == -1;
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if (*m < 0) {
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*info = -1;
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} else if (*n < 0) {
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*info = -2;
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} else if (*lda < max(1, *m)) {
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*info = -4;
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} else if (!lquery) {
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if (*lwork <= 0 || *n > 0 && *lwork < max(1, *m)) {
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*info = -7;
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}
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"DGELQF", &i__1, (ftnlen)6);
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return 0;
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} else if (lquery) {
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if (k == 0) {
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lwkopt = 1;
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} else {
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lwkopt = *m * nb;
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}
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work[1] = (doublereal)lwkopt;
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return 0;
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}
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if (k == 0) {
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work[1] = 1.;
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return 0;
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}
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nbmin = 2;
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nx = 0;
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iws = *m;
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if (nb > 1 && nb < k) {
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i__1 = 0, i__2 = ilaenv_(&c__3, (char *)"DGELQF", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
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nx = max(i__1, i__2);
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if (nx < k) {
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ldwork = *m;
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iws = ldwork * nb;
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if (*lwork < iws) {
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nb = *lwork / ldwork;
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i__1 = 2,
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i__2 = ilaenv_(&c__2, (char *)"DGELQF", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
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nbmin = max(i__1, i__2);
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}
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}
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}
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if (nb >= nbmin && nb < k && nx < k) {
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i__1 = k - nx;
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i__2 = nb;
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for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
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i__3 = k - i__ + 1;
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ib = min(i__3, nb);
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i__3 = *n - i__ + 1;
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dgelq2_(&ib, &i__3, &a[i__ + i__ * a_dim1], lda, &tau[i__], &work[1], &iinfo);
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if (i__ + ib <= *m) {
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i__3 = *n - i__ + 1;
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dlarft_((char *)"F", (char *)"R", &i__3, &ib, &a[i__ + i__ * a_dim1], lda, &tau[i__], &work[1],
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&ldwork, (ftnlen)1, (ftnlen)1);
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i__3 = *m - i__ - ib + 1;
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i__4 = *n - i__ + 1;
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dlarfb_((char *)"R", (char *)"N", (char *)"F", (char *)"R", &i__3, &i__4, &ib, &a[i__ + i__ * a_dim1], lda,
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&work[1], &ldwork, &a[i__ + ib + i__ * a_dim1], lda, &work[ib + 1], &ldwork,
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(ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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}
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}
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} else {
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i__ = 1;
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}
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if (i__ <= k) {
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i__2 = *m - i__ + 1;
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i__1 = *n - i__ + 1;
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dgelq2_(&i__2, &i__1, &a[i__ + i__ * a_dim1], lda, &tau[i__], &work[1], &iinfo);
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}
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work[1] = (doublereal)iws;
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return 0;
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}
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#ifdef __cplusplus
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}
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#endif
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