aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/clapack/ztrexc.c
diff options
context:
space:
mode:
authorshmel1k <shmel1k@ydb.tech>2022-09-02 12:44:59 +0300
committershmel1k <shmel1k@ydb.tech>2022-09-02 12:44:59 +0300
commit90d450f74722da7859d6f510a869f6c6908fd12f (patch)
tree538c718dedc76cdfe37ad6d01ff250dd930d9278 /contrib/libs/clapack/ztrexc.c
parent01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff)
downloadydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/ztrexc.c')
-rw-r--r--contrib/libs/clapack/ztrexc.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/contrib/libs/clapack/ztrexc.c b/contrib/libs/clapack/ztrexc.c
new file mode 100644
index 0000000000..730babeea0
--- /dev/null
+++ b/contrib/libs/clapack/ztrexc.c
@@ -0,0 +1,216 @@
+/* ztrexc.f -- translated by f2c (version 20061008).
+ You must link the resulting object file with libf2c:
+ on Microsoft Windows system, link with libf2c.lib;
+ on Linux or Unix systems, link with .../path/to/libf2c.a -lm
+ or, if you install libf2c.a in a standard place, with -lf2c -lm
+ -- in that order, at the end of the command line, as in
+ cc *.o -lf2c -lm
+ Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
+
+ http://www.netlib.org/f2c/libf2c.zip
+*/
+
+#include "f2c.h"
+#include "blaswrap.h"
+
+/* Table of constant values */
+
+static integer c__1 = 1;
+
+/* Subroutine */ int ztrexc_(char *compq, integer *n, doublecomplex *t,
+ integer *ldt, doublecomplex *q, integer *ldq, integer *ifst, integer *
+ ilst, integer *info)
+{
+ /* System generated locals */
+ integer q_dim1, q_offset, t_dim1, t_offset, i__1, i__2, i__3;
+ doublecomplex z__1;
+
+ /* Builtin functions */
+ void d_cnjg(doublecomplex *, doublecomplex *);
+
+ /* Local variables */
+ integer k, m1, m2, m3;
+ doublereal cs;
+ doublecomplex t11, t22, sn, temp;
+ extern /* Subroutine */ int zrot_(integer *, doublecomplex *, integer *,
+ doublecomplex *, integer *, doublereal *, doublecomplex *);
+ extern logical lsame_(char *, char *);
+ logical wantq;
+ extern /* Subroutine */ int xerbla_(char *, integer *), zlartg_(
+ doublecomplex *, doublecomplex *, doublereal *, doublecomplex *,
+ doublecomplex *);
+
+
+/* -- LAPACK routine (version 3.2) -- */
+/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
+/* November 2006 */
+
+/* .. Scalar Arguments .. */
+/* .. */
+/* .. Array Arguments .. */
+/* .. */
+
+/* Purpose */
+/* ======= */
+
+/* ZTREXC reorders the Schur factorization of a complex matrix */
+/* A = Q*T*Q**H, so that the diagonal element of T with row index IFST */
+/* is moved to row ILST. */
+
+/* The Schur form T is reordered by a unitary similarity transformation */
+/* Z**H*T*Z, and optionally the matrix Q of Schur vectors is updated by */
+/* postmultplying it with Z. */
+
+/* Arguments */
+/* ========= */
+
+/* COMPQ (input) CHARACTER*1 */
+/* = 'V': update the matrix Q of Schur vectors; */
+/* = 'N': do not update Q. */
+
+/* N (input) INTEGER */
+/* The order of the matrix T. N >= 0. */
+
+/* T (input/output) COMPLEX*16 array, dimension (LDT,N) */
+/* On entry, the upper triangular matrix T. */
+/* On exit, the reordered upper triangular matrix. */
+
+/* LDT (input) INTEGER */
+/* The leading dimension of the array T. LDT >= max(1,N). */
+
+/* Q (input/output) COMPLEX*16 array, dimension (LDQ,N) */
+/* On entry, if COMPQ = 'V', the matrix Q of Schur vectors. */
+/* On exit, if COMPQ = 'V', Q has been postmultiplied by the */
+/* unitary transformation matrix Z which reorders T. */
+/* If COMPQ = 'N', Q is not referenced. */
+
+/* LDQ (input) INTEGER */
+/* The leading dimension of the array Q. LDQ >= max(1,N). */
+
+/* IFST (input) INTEGER */
+/* ILST (input) INTEGER */
+/* Specify the reordering of the diagonal elements of T: */
+/* The element with row index IFST is moved to row ILST by a */
+/* sequence of transpositions between adjacent elements. */
+/* 1 <= IFST <= N; 1 <= ILST <= N. */
+
+/* INFO (output) INTEGER */
+/* = 0: successful exit */
+/* < 0: if INFO = -i, the i-th argument had an illegal value */
+
+/* ===================================================================== */
+
+/* .. Local Scalars .. */
+/* .. */
+/* .. External Functions .. */
+/* .. */
+/* .. External Subroutines .. */
+/* .. */
+/* .. Intrinsic Functions .. */
+/* .. */
+/* .. Executable Statements .. */
+
+/* Decode and test the input parameters. */
+
+ /* Parameter adjustments */
+ t_dim1 = *ldt;
+ t_offset = 1 + t_dim1;
+ t -= t_offset;
+ q_dim1 = *ldq;
+ q_offset = 1 + q_dim1;
+ q -= q_offset;
+
+ /* Function Body */
+ *info = 0;
+ wantq = lsame_(compq, "V");
+ if (! lsame_(compq, "N") && ! wantq) {
+ *info = -1;
+ } else if (*n < 0) {
+ *info = -2;
+ } else if (*ldt < max(1,*n)) {
+ *info = -4;
+ } else if (*ldq < 1 || wantq && *ldq < max(1,*n)) {
+ *info = -6;
+ } else if (*ifst < 1 || *ifst > *n) {
+ *info = -7;
+ } else if (*ilst < 1 || *ilst > *n) {
+ *info = -8;
+ }
+ if (*info != 0) {
+ i__1 = -(*info);
+ xerbla_("ZTREXC", &i__1);
+ return 0;
+ }
+
+/* Quick return if possible */
+
+ if (*n == 1 || *ifst == *ilst) {
+ return 0;
+ }
+
+ if (*ifst < *ilst) {
+
+/* Move the IFST-th diagonal element forward down the diagonal. */
+
+ m1 = 0;
+ m2 = -1;
+ m3 = 1;
+ } else {
+
+/* Move the IFST-th diagonal element backward up the diagonal. */
+
+ m1 = -1;
+ m2 = 0;
+ m3 = -1;
+ }
+
+ i__1 = *ilst + m2;
+ i__2 = m3;
+ for (k = *ifst + m1; i__2 < 0 ? k >= i__1 : k <= i__1; k += i__2) {
+
+/* Interchange the k-th and (k+1)-th diagonal elements. */
+
+ i__3 = k + k * t_dim1;
+ t11.r = t[i__3].r, t11.i = t[i__3].i;
+ i__3 = k + 1 + (k + 1) * t_dim1;
+ t22.r = t[i__3].r, t22.i = t[i__3].i;
+
+/* Determine the transformation to perform the interchange. */
+
+ z__1.r = t22.r - t11.r, z__1.i = t22.i - t11.i;
+ zlartg_(&t[k + (k + 1) * t_dim1], &z__1, &cs, &sn, &temp);
+
+/* Apply transformation to the matrix T. */
+
+ if (k + 2 <= *n) {
+ i__3 = *n - k - 1;
+ zrot_(&i__3, &t[k + (k + 2) * t_dim1], ldt, &t[k + 1 + (k + 2) *
+ t_dim1], ldt, &cs, &sn);
+ }
+ i__3 = k - 1;
+ d_cnjg(&z__1, &sn);
+ zrot_(&i__3, &t[k * t_dim1 + 1], &c__1, &t[(k + 1) * t_dim1 + 1], &
+ c__1, &cs, &z__1);
+
+ i__3 = k + k * t_dim1;
+ t[i__3].r = t22.r, t[i__3].i = t22.i;
+ i__3 = k + 1 + (k + 1) * t_dim1;
+ t[i__3].r = t11.r, t[i__3].i = t11.i;
+
+ if (wantq) {
+
+/* Accumulate transformation in the matrix Q. */
+
+ d_cnjg(&z__1, &sn);
+ zrot_(n, &q[k * q_dim1 + 1], &c__1, &q[(k + 1) * q_dim1 + 1], &
+ c__1, &cs, &z__1);
+ }
+
+/* L10: */
+ }
+
+ return 0;
+
+/* End of ZTREXC */
+
+} /* ztrexc_ */