198 lines
8.1 KiB
C++
198 lines
8.1 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 doublecomplex c_b1 = {1., 0.};
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static integer c__1 = 1;
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int zhegs2_(integer *itype, char *uplo, integer *n, doublecomplex *a, integer *lda,
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doublecomplex *b, integer *ldb, integer *info, ftnlen uplo_len)
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{
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integer a_dim1, a_offset, b_dim1, b_offset, i__1, i__2;
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doublereal d__1, d__2;
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doublecomplex z__1;
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integer k;
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doublecomplex ct;
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doublereal akk, bkk;
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extern int zher2_(char *, integer *, doublecomplex *, doublecomplex *, integer *,
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doublecomplex *, integer *, doublecomplex *, integer *, ftnlen);
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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logical upper;
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extern int zaxpy_(integer *, doublecomplex *, doublecomplex *, integer *, doublecomplex *,
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integer *),
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ztrmv_(char *, char *, char *, integer *, doublecomplex *, integer *, doublecomplex *,
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integer *, ftnlen, ftnlen, ftnlen),
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ztrsv_(char *, char *, char *, integer *, doublecomplex *, integer *, doublecomplex *,
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integer *, ftnlen, ftnlen, ftnlen),
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xerbla_(char *, integer *, ftnlen),
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zdscal_(integer *, doublereal *, doublecomplex *, integer *),
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zlacgv_(integer *, doublecomplex *, integer *);
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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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b_dim1 = *ldb;
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b_offset = 1 + b_dim1;
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b -= b_offset;
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*info = 0;
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upper = lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)1);
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if (*itype < 1 || *itype > 3) {
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*info = -1;
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} else if (!upper && !lsame_(uplo, (char *)"L", (ftnlen)1, (ftnlen)1)) {
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*info = -2;
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} else if (*n < 0) {
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*info = -3;
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} else if (*lda < max(1, *n)) {
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*info = -5;
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} else if (*ldb < max(1, *n)) {
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*info = -7;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"ZHEGS2", &i__1, (ftnlen)6);
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return 0;
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}
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if (*itype == 1) {
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if (upper) {
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i__1 = *n;
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for (k = 1; k <= i__1; ++k) {
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i__2 = k + k * a_dim1;
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akk = a[i__2].r;
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i__2 = k + k * b_dim1;
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bkk = b[i__2].r;
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d__1 = bkk;
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akk /= d__1 * d__1;
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i__2 = k + k * a_dim1;
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a[i__2].r = akk, a[i__2].i = 0.;
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if (k < *n) {
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i__2 = *n - k;
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d__1 = 1. / bkk;
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zdscal_(&i__2, &d__1, &a[k + (k + 1) * a_dim1], lda);
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d__1 = akk * -.5;
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ct.r = d__1, ct.i = 0.;
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i__2 = *n - k;
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zlacgv_(&i__2, &a[k + (k + 1) * a_dim1], lda);
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i__2 = *n - k;
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zlacgv_(&i__2, &b[k + (k + 1) * b_dim1], ldb);
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i__2 = *n - k;
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zaxpy_(&i__2, &ct, &b[k + (k + 1) * b_dim1], ldb, &a[k + (k + 1) * a_dim1],
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lda);
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i__2 = *n - k;
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z__1.r = -1., z__1.i = -0.;
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zher2_(uplo, &i__2, &z__1, &a[k + (k + 1) * a_dim1], lda,
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&b[k + (k + 1) * b_dim1], ldb, &a[k + 1 + (k + 1) * a_dim1], lda,
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(ftnlen)1);
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i__2 = *n - k;
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zaxpy_(&i__2, &ct, &b[k + (k + 1) * b_dim1], ldb, &a[k + (k + 1) * a_dim1],
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lda);
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i__2 = *n - k;
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zlacgv_(&i__2, &b[k + (k + 1) * b_dim1], ldb);
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i__2 = *n - k;
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ztrsv_(uplo, (char *)"Conjugate transpose", (char *)"Non-unit", &i__2,
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&b[k + 1 + (k + 1) * b_dim1], ldb, &a[k + (k + 1) * a_dim1], lda,
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(ftnlen)1, (ftnlen)19, (ftnlen)8);
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i__2 = *n - k;
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zlacgv_(&i__2, &a[k + (k + 1) * a_dim1], lda);
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}
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}
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} else {
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i__1 = *n;
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for (k = 1; k <= i__1; ++k) {
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i__2 = k + k * a_dim1;
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akk = a[i__2].r;
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i__2 = k + k * b_dim1;
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bkk = b[i__2].r;
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d__1 = bkk;
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akk /= d__1 * d__1;
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i__2 = k + k * a_dim1;
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a[i__2].r = akk, a[i__2].i = 0.;
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if (k < *n) {
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i__2 = *n - k;
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d__1 = 1. / bkk;
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zdscal_(&i__2, &d__1, &a[k + 1 + k * a_dim1], &c__1);
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d__1 = akk * -.5;
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ct.r = d__1, ct.i = 0.;
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i__2 = *n - k;
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zaxpy_(&i__2, &ct, &b[k + 1 + k * b_dim1], &c__1, &a[k + 1 + k * a_dim1],
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&c__1);
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i__2 = *n - k;
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z__1.r = -1., z__1.i = -0.;
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zher2_(uplo, &i__2, &z__1, &a[k + 1 + k * a_dim1], &c__1,
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&b[k + 1 + k * b_dim1], &c__1, &a[k + 1 + (k + 1) * a_dim1], lda,
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(ftnlen)1);
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i__2 = *n - k;
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zaxpy_(&i__2, &ct, &b[k + 1 + k * b_dim1], &c__1, &a[k + 1 + k * a_dim1],
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&c__1);
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i__2 = *n - k;
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ztrsv_(uplo, (char *)"No transpose", (char *)"Non-unit", &i__2, &b[k + 1 + (k + 1) * b_dim1],
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ldb, &a[k + 1 + k * a_dim1], &c__1, (ftnlen)1, (ftnlen)12, (ftnlen)8);
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}
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}
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}
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} else {
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if (upper) {
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i__1 = *n;
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for (k = 1; k <= i__1; ++k) {
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i__2 = k + k * a_dim1;
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akk = a[i__2].r;
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i__2 = k + k * b_dim1;
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bkk = b[i__2].r;
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i__2 = k - 1;
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ztrmv_(uplo, (char *)"No transpose", (char *)"Non-unit", &i__2, &b[b_offset], ldb,
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&a[k * a_dim1 + 1], &c__1, (ftnlen)1, (ftnlen)12, (ftnlen)8);
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d__1 = akk * .5;
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ct.r = d__1, ct.i = 0.;
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i__2 = k - 1;
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zaxpy_(&i__2, &ct, &b[k * b_dim1 + 1], &c__1, &a[k * a_dim1 + 1], &c__1);
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i__2 = k - 1;
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zher2_(uplo, &i__2, &c_b1, &a[k * a_dim1 + 1], &c__1, &b[k * b_dim1 + 1], &c__1,
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&a[a_offset], lda, (ftnlen)1);
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i__2 = k - 1;
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zaxpy_(&i__2, &ct, &b[k * b_dim1 + 1], &c__1, &a[k * a_dim1 + 1], &c__1);
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i__2 = k - 1;
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zdscal_(&i__2, &bkk, &a[k * a_dim1 + 1], &c__1);
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i__2 = k + k * a_dim1;
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d__2 = bkk;
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d__1 = akk * (d__2 * d__2);
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a[i__2].r = d__1, a[i__2].i = 0.;
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}
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} else {
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i__1 = *n;
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for (k = 1; k <= i__1; ++k) {
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i__2 = k + k * a_dim1;
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akk = a[i__2].r;
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i__2 = k + k * b_dim1;
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bkk = b[i__2].r;
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i__2 = k - 1;
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zlacgv_(&i__2, &a[k + a_dim1], lda);
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i__2 = k - 1;
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ztrmv_(uplo, (char *)"Conjugate transpose", (char *)"Non-unit", &i__2, &b[b_offset], ldb,
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&a[k + a_dim1], lda, (ftnlen)1, (ftnlen)19, (ftnlen)8);
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d__1 = akk * .5;
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ct.r = d__1, ct.i = 0.;
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i__2 = k - 1;
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zlacgv_(&i__2, &b[k + b_dim1], ldb);
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i__2 = k - 1;
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zaxpy_(&i__2, &ct, &b[k + b_dim1], ldb, &a[k + a_dim1], lda);
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i__2 = k - 1;
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zher2_(uplo, &i__2, &c_b1, &a[k + a_dim1], lda, &b[k + b_dim1], ldb, &a[a_offset],
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lda, (ftnlen)1);
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i__2 = k - 1;
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zaxpy_(&i__2, &ct, &b[k + b_dim1], ldb, &a[k + a_dim1], lda);
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i__2 = k - 1;
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zlacgv_(&i__2, &b[k + b_dim1], ldb);
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i__2 = k - 1;
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zdscal_(&i__2, &bkk, &a[k + a_dim1], lda);
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i__2 = k - 1;
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zlacgv_(&i__2, &a[k + a_dim1], lda);
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i__2 = k + k * a_dim1;
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d__2 = bkk;
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d__1 = akk * (d__2 * d__2);
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a[i__2].r = d__1, a[i__2].i = 0.;
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}
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}
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}
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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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