238 lines
8.6 KiB
C++
238 lines
8.6 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__9 = 9;
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static integer c__0 = 0;
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static integer c__2 = 2;
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static doublereal c_b17 = 0.;
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static doublereal c_b18 = 1.;
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static integer c__1 = 1;
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int zstedc_(char *compz, integer *n, doublereal *d__, doublereal *e, doublecomplex *z__,
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integer *ldz, doublecomplex *work, integer *lwork, doublereal *rwork, integer *lrwork,
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integer *iwork, integer *liwork, integer *info, ftnlen compz_len)
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{
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integer z_dim1, z_offset, i__1, i__2, i__3, i__4;
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doublereal d__1, d__2;
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double log(doublereal);
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integer pow_lmp_ii(integer *, integer *);
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double sqrt(doublereal);
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integer i__, j, k, m;
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doublereal p;
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integer ii, ll, lgn;
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doublereal eps, tiny;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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integer lwmin, start;
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extern int zswap_(integer *, doublecomplex *, integer *, doublecomplex *, integer *),
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zlaed0_(integer *, integer *, doublereal *, doublereal *, doublecomplex *, integer *,
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doublecomplex *, integer *, doublereal *, integer *, integer *);
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extern doublereal dlamch_(char *, ftnlen);
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extern int dlascl_(char *, integer *, integer *, doublereal *, doublereal *, integer *,
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integer *, doublereal *, integer *, integer *, ftnlen),
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dstedc_(char *, integer *, doublereal *, doublereal *, doublereal *, integer *,
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doublereal *, integer *, integer *, integer *, integer *, ftnlen),
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dlaset_(char *, integer *, integer *, doublereal *, doublereal *, doublereal *, integer *,
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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 finish;
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extern doublereal dlanst_(char *, integer *, doublereal *, doublereal *, ftnlen);
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extern int dsterf_(integer *, doublereal *, doublereal *, integer *),
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zlacrm_(integer *, integer *, doublecomplex *, integer *, doublereal *, integer *,
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doublecomplex *, integer *, doublereal *);
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integer liwmin, icompz;
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extern int dsteqr_(char *, integer *, doublereal *, doublereal *, doublereal *, integer *,
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doublereal *, integer *, ftnlen),
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zlacpy_(char *, integer *, integer *, doublecomplex *, integer *, doublecomplex *,
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integer *, ftnlen);
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doublereal orgnrm;
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integer lrwmin;
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logical lquery;
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integer smlsiz;
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extern int zsteqr_(char *, integer *, doublereal *, doublereal *, doublecomplex *, integer *,
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doublereal *, integer *, ftnlen);
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--d__;
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--e;
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z_dim1 = *ldz;
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z_offset = 1 + z_dim1;
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z__ -= z_offset;
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--work;
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--rwork;
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--iwork;
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*info = 0;
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lquery = *lwork == -1 || *lrwork == -1 || *liwork == -1;
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if (lsame_(compz, (char *)"N", (ftnlen)1, (ftnlen)1)) {
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icompz = 0;
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} else if (lsame_(compz, (char *)"V", (ftnlen)1, (ftnlen)1)) {
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icompz = 1;
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} else if (lsame_(compz, (char *)"I", (ftnlen)1, (ftnlen)1)) {
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icompz = 2;
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} else {
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icompz = -1;
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}
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if (icompz < 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 (*ldz < 1 || icompz > 0 && *ldz < max(1, *n)) {
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*info = -6;
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}
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if (*info == 0) {
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smlsiz = ilaenv_(&c__9, (char *)"ZSTEDC", (char *)" ", &c__0, &c__0, &c__0, &c__0, (ftnlen)6, (ftnlen)1);
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if (*n <= 1 || icompz == 0) {
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lwmin = 1;
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liwmin = 1;
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lrwmin = 1;
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} else if (*n <= smlsiz) {
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lwmin = 1;
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liwmin = 1;
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lrwmin = *n - 1 << 1;
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} else if (icompz == 1) {
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lgn = (integer)(log((doublereal)(*n)) / log(2.));
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if (pow_lmp_ii(&c__2, &lgn) < *n) {
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++lgn;
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}
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if (pow_lmp_ii(&c__2, &lgn) < *n) {
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++lgn;
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}
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lwmin = *n * *n;
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i__1 = *n;
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lrwmin = *n * 3 + 1 + (*n << 1) * lgn + (i__1 * i__1 << 2);
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liwmin = *n * 6 + 6 + *n * 5 * lgn;
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} else if (icompz == 2) {
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lwmin = 1;
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i__1 = *n;
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lrwmin = (*n << 2) + 1 + (i__1 * i__1 << 1);
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liwmin = *n * 5 + 3;
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}
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work[1].r = (doublereal)lwmin, work[1].i = 0.;
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rwork[1] = (real)lrwmin;
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iwork[1] = liwmin;
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if (*lwork < lwmin && !lquery) {
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*info = -8;
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} else if (*lrwork < lrwmin && !lquery) {
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*info = -10;
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} else if (*liwork < liwmin && !lquery) {
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*info = -12;
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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 *)"ZSTEDC", &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 (*n == 0) {
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return 0;
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}
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if (*n == 1) {
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if (icompz != 0) {
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i__1 = z_dim1 + 1;
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z__[i__1].r = 1., z__[i__1].i = 0.;
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}
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return 0;
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}
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if (icompz == 0) {
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dsterf_(n, &d__[1], &e[1], info);
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goto L70;
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}
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if (*n <= smlsiz) {
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zsteqr_(compz, n, &d__[1], &e[1], &z__[z_offset], ldz, &rwork[1], info, (ftnlen)1);
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} else {
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if (icompz == 2) {
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dlaset_((char *)"F", n, n, &c_b17, &c_b18, &rwork[1], n, (ftnlen)1);
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ll = *n * *n + 1;
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i__1 = *lrwork - ll + 1;
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dstedc_((char *)"I", n, &d__[1], &e[1], &rwork[1], n, &rwork[ll], &i__1, &iwork[1], liwork,
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info, (ftnlen)1);
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i__1 = *n;
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for (j = 1; j <= i__1; ++j) {
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i__2 = *n;
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for (i__ = 1; i__ <= i__2; ++i__) {
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i__3 = i__ + j * z_dim1;
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i__4 = (j - 1) * *n + i__;
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z__[i__3].r = rwork[i__4], z__[i__3].i = 0.;
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}
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}
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goto L70;
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}
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orgnrm = dlanst_((char *)"M", n, &d__[1], &e[1], (ftnlen)1);
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if (orgnrm == 0.) {
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goto L70;
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}
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eps = dlamch_((char *)"Epsilon", (ftnlen)7);
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start = 1;
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L30:
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if (start <= *n) {
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finish = start;
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L40:
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if (finish < *n) {
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tiny = eps * sqrt((d__1 = d__[finish], abs(d__1))) *
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sqrt((d__2 = d__[finish + 1], abs(d__2)));
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if ((d__1 = e[finish], abs(d__1)) > tiny) {
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++finish;
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goto L40;
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}
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}
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m = finish - start + 1;
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if (m > smlsiz) {
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orgnrm = dlanst_((char *)"M", &m, &d__[start], &e[start], (ftnlen)1);
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dlascl_((char *)"G", &c__0, &c__0, &orgnrm, &c_b18, &m, &c__1, &d__[start], &m, info,
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(ftnlen)1);
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i__1 = m - 1;
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i__2 = m - 1;
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dlascl_((char *)"G", &c__0, &c__0, &orgnrm, &c_b18, &i__1, &c__1, &e[start], &i__2, info,
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(ftnlen)1);
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zlaed0_(n, &m, &d__[start], &e[start], &z__[start * z_dim1 + 1], ldz, &work[1], n,
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&rwork[1], &iwork[1], info);
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if (*info > 0) {
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*info = (*info / (m + 1) + start - 1) * (*n + 1) + *info % (m + 1) + start - 1;
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goto L70;
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}
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dlascl_((char *)"G", &c__0, &c__0, &c_b18, &orgnrm, &m, &c__1, &d__[start], &m, info,
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(ftnlen)1);
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} else {
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dsteqr_((char *)"I", &m, &d__[start], &e[start], &rwork[1], &m, &rwork[m * m + 1], info,
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(ftnlen)1);
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zlacrm_(n, &m, &z__[start * z_dim1 + 1], ldz, &rwork[1], &m, &work[1], n,
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&rwork[m * m + 1]);
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zlacpy_((char *)"A", n, &m, &work[1], n, &z__[start * z_dim1 + 1], ldz, (ftnlen)1);
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if (*info > 0) {
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*info = start * (*n + 1) + finish;
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goto L70;
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}
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}
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start = finish + 1;
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goto L30;
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}
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i__1 = *n;
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for (ii = 2; ii <= i__1; ++ii) {
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i__ = ii - 1;
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k = i__;
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p = d__[i__];
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i__2 = *n;
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for (j = ii; j <= i__2; ++j) {
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if (d__[j] < p) {
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k = j;
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p = d__[j];
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}
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}
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if (k != i__) {
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d__[k] = d__[i__];
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d__[i__] = p;
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zswap_(n, &z__[i__ * z_dim1 + 1], &c__1, &z__[k * z_dim1 + 1], &c__1);
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}
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}
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}
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L70:
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work[1].r = (doublereal)lwmin, work[1].i = 0.;
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rwork[1] = (real)lrwmin;
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iwork[1] = liwmin;
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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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