128 lines
4.4 KiB
C++
128 lines
4.4 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 dorglq_(integer *m, integer *n, integer *k, doublereal *a, integer *lda, doublereal *tau,
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doublereal *work, integer *lwork, integer *info)
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{
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integer a_dim1, a_offset, i__1, i__2, i__3;
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integer i__, j, l, ib, nb, ki, kk, nx, iws, nbmin, iinfo;
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extern int dorgl2_(integer *, integer *, integer *, doublereal *, integer *, doublereal *,
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doublereal *, 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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nb = ilaenv_(&c__1, (char *)"DORGLQ", (char *)" ", m, n, k, &c_n1, (ftnlen)6, (ftnlen)1);
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lwkopt = max(1, *m) * nb;
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work[1] = (doublereal)lwkopt;
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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 < *m) {
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*info = -2;
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} else if (*k < 0 || *k > *m) {
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*info = -3;
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} else if (*lda < max(1, *m)) {
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*info = -5;
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} else if (*lwork < max(1, *m) && !lquery) {
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*info = -8;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"DORGLQ", &i__1, (ftnlen)6);
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return 0;
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} else if (lquery) {
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return 0;
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}
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if (*m <= 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 *)"DORGLQ", (char *)" ", m, n, k, &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 *)"DORGLQ", (char *)" ", m, n, k, &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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ki = (*k - nx - 1) / nb * nb;
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i__1 = *k, i__2 = ki + nb;
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kk = min(i__1, i__2);
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i__1 = kk;
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for (j = 1; j <= i__1; ++j) {
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i__2 = *m;
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for (i__ = kk + 1; i__ <= i__2; ++i__) {
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a[i__ + j * a_dim1] = 0.;
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}
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}
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} else {
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kk = 0;
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}
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if (kk < *m) {
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i__1 = *m - kk;
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i__2 = *n - kk;
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i__3 = *k - kk;
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dorgl2_(&i__1, &i__2, &i__3, &a[kk + 1 + (kk + 1) * a_dim1], lda, &tau[kk + 1], &work[1],
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&iinfo);
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}
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if (kk > 0) {
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i__1 = -nb;
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for (i__ = ki + 1; i__1 < 0 ? i__ >= 1 : i__ <= 1; i__ += i__1) {
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i__2 = nb, i__3 = *k - i__ + 1;
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ib = min(i__2, i__3);
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if (i__ + ib <= *m) {
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i__2 = *n - i__ + 1;
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dlarft_((char *)"Forward", (char *)"Rowwise", &i__2, &ib, &a[i__ + i__ * a_dim1], lda, &tau[i__],
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&work[1], &ldwork, (ftnlen)7, (ftnlen)7);
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i__2 = *m - i__ - ib + 1;
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i__3 = *n - i__ + 1;
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dlarfb_((char *)"Right", (char *)"Transpose", (char *)"Forward", (char *)"Rowwise", &i__2, &i__3, &ib,
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&a[i__ + i__ * a_dim1], lda, &work[1], &ldwork, &a[i__ + ib + i__ * a_dim1],
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lda, &work[ib + 1], &ldwork, (ftnlen)5, (ftnlen)9, (ftnlen)7, (ftnlen)7);
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}
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i__2 = *n - i__ + 1;
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dorgl2_(&ib, &i__2, &ib, &a[i__ + i__ * a_dim1], lda, &tau[i__], &work[1], &iinfo);
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i__2 = i__ - 1;
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for (j = 1; j <= i__2; ++j) {
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i__3 = i__ + ib - 1;
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for (l = i__; l <= i__3; ++l) {
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a[l + j * a_dim1] = 0.;
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}
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}
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}
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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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