68 lines
1.8 KiB
C++
68 lines
1.8 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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int dorg2l_(integer *m, integer *n, integer *k, doublereal *a, integer *lda, doublereal *tau,
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doublereal *work, 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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doublereal d__1;
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integer i__, j, l, ii;
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extern int dscal_(integer *, doublereal *, doublereal *, integer *),
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xerbla_(char *, integer *, ftnlen),
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dlarf1l_(char *, integer *, integer *, doublereal *, integer *, doublereal *, doublereal *,
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integer *, doublereal *, ftnlen);
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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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if (*m < 0) {
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*info = -1;
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} else if (*n < 0 || *n > *m) {
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*info = -2;
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} else if (*k < 0 || *k > *n) {
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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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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"DORG2L", &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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i__1 = *n - *k;
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for (j = 1; j <= i__1; ++j) {
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i__2 = *m;
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for (l = 1; l <= i__2; ++l) {
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a[l + j * a_dim1] = 0.;
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}
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a[*m - *n + j + j * a_dim1] = 1.;
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}
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i__1 = *k;
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for (i__ = 1; i__ <= i__1; ++i__) {
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ii = *n - *k + i__;
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i__2 = *m - *n + ii;
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i__3 = ii - 1;
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dlarf1l_((char *)"L", &i__2, &i__3, &a[ii * a_dim1 + 1], &c__1, &tau[i__], &a[a_offset], lda,
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&work[1], (ftnlen)1);
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i__2 = *m - *n + ii - 1;
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d__1 = -tau[i__];
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dscal_(&i__2, &d__1, &a[ii * a_dim1 + 1], &c__1);
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a[*m - *n + ii + ii * a_dim1] = 1. - tau[i__];
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i__2 = *m;
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for (l = *m - *n + ii + 1; l <= i__2; ++l) {
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a[l + ii * a_dim1] = 0.;
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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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