91 lines
2.9 KiB
C++
91 lines
2.9 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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int dlaed1_(integer *n, doublereal *d__, doublereal *q, integer *ldq, integer *indxq,
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doublereal *rho, integer *cutpnt, doublereal *work, integer *iwork, integer *info)
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{
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integer q_dim1, q_offset, i__1, i__2;
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integer i__, k, n1, n2, is, iw, iz, iq2, zpp1, indx, indxc;
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extern int dcopy_(integer *, doublereal *, integer *, doublereal *, integer *);
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integer indxp;
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extern int dlaed2_(integer *, integer *, integer *, doublereal *, doublereal *, integer *,
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integer *, doublereal *, doublereal *, doublereal *, doublereal *,
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doublereal *, integer *, integer *, integer *, integer *, integer *),
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dlaed3_(integer *, integer *, integer *, doublereal *, doublereal *, integer *,
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doublereal *, doublereal *, doublereal *, integer *, integer *, doublereal *,
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doublereal *, integer *);
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integer idlmda;
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extern int dlamrg_(integer *, integer *, doublereal *, integer *, integer *, integer *),
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xerbla_(char *, integer *, ftnlen);
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integer coltyp;
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--d__;
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q_dim1 = *ldq;
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q_offset = 1 + q_dim1;
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q -= q_offset;
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--indxq;
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--work;
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--iwork;
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*info = 0;
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if (*n < 0) {
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*info = -1;
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} else if (*ldq < max(1, *n)) {
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*info = -4;
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} else {
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i__1 = 1, i__2 = *n / 2;
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if (min(i__1, i__2) > *cutpnt || *n / 2 < *cutpnt) {
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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 *)"DLAED1", &i__1, (ftnlen)6);
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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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iz = 1;
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idlmda = iz + *n;
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iw = idlmda + *n;
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iq2 = iw + *n;
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indx = 1;
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indxc = indx + *n;
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coltyp = indxc + *n;
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indxp = coltyp + *n;
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dcopy_(cutpnt, &q[*cutpnt + q_dim1], ldq, &work[iz], &c__1);
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zpp1 = *cutpnt + 1;
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i__1 = *n - *cutpnt;
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dcopy_(&i__1, &q[zpp1 + zpp1 * q_dim1], ldq, &work[iz + *cutpnt], &c__1);
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dlaed2_(&k, n, cutpnt, &d__[1], &q[q_offset], ldq, &indxq[1], rho, &work[iz], &work[idlmda],
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&work[iw], &work[iq2], &iwork[indx], &iwork[indxc], &iwork[indxp], &iwork[coltyp],
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info);
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if (*info != 0) {
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goto L20;
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}
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if (k != 0) {
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is = (iwork[coltyp] + iwork[coltyp + 1]) * *cutpnt +
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(iwork[coltyp + 1] + iwork[coltyp + 2]) * (*n - *cutpnt) + iq2;
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dlaed3_(&k, n, cutpnt, &d__[1], &q[q_offset], ldq, rho, &work[idlmda], &work[iq2],
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&iwork[indxc], &iwork[coltyp], &work[iw], &work[is], info);
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if (*info != 0) {
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goto L20;
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}
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n1 = k;
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n2 = *n - k;
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dlamrg_(&n1, &n2, &d__[1], &c__1, &c_n1, &indxq[1]);
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} else {
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i__1 = *n;
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for (i__ = 1; i__ <= i__1; ++i__) {
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indxq[i__] = i__;
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}
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}
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L20:
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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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