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author | shmel1k <shmel1k@ydb.tech> | 2022-09-02 12:44:59 +0300 |
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committer | shmel1k <shmel1k@ydb.tech> | 2022-09-02 12:44:59 +0300 |
commit | 90d450f74722da7859d6f510a869f6c6908fd12f (patch) | |
tree | 538c718dedc76cdfe37ad6d01ff250dd930d9278 /contrib/libs/clapack/dlaexc.c | |
parent | 01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff) | |
download | ydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz |
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/dlaexc.c')
-rw-r--r-- | contrib/libs/clapack/dlaexc.c | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/contrib/libs/clapack/dlaexc.c b/contrib/libs/clapack/dlaexc.c new file mode 100644 index 0000000000..03d6679702 --- /dev/null +++ b/contrib/libs/clapack/dlaexc.c @@ -0,0 +1,459 @@ +/* dlaexc.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; +static integer c__4 = 4; +static logical c_false = FALSE_; +static integer c_n1 = -1; +static integer c__2 = 2; +static integer c__3 = 3; + +/* Subroutine */ int dlaexc_(logical *wantq, integer *n, doublereal *t, + integer *ldt, doublereal *q, integer *ldq, integer *j1, integer *n1, + integer *n2, doublereal *work, integer *info) +{ + /* System generated locals */ + integer q_dim1, q_offset, t_dim1, t_offset, i__1; + doublereal d__1, d__2, d__3; + + /* Local variables */ + doublereal d__[16] /* was [4][4] */; + integer k; + doublereal u[3], x[4] /* was [2][2] */; + integer j2, j3, j4; + doublereal u1[3], u2[3]; + integer nd; + doublereal cs, t11, t22, t33, sn, wi1, wi2, wr1, wr2, eps, tau, tau1, + tau2; + integer ierr; + doublereal temp; + extern /* Subroutine */ int drot_(integer *, doublereal *, integer *, + doublereal *, integer *, doublereal *, doublereal *); + doublereal scale, dnorm, xnorm; + extern /* Subroutine */ int dlanv2_(doublereal *, doublereal *, + doublereal *, doublereal *, doublereal *, doublereal *, + doublereal *, doublereal *, doublereal *, doublereal *), dlasy2_( + logical *, logical *, integer *, integer *, integer *, doublereal + *, integer *, doublereal *, integer *, doublereal *, integer *, + doublereal *, doublereal *, integer *, doublereal *, integer *); + extern doublereal dlamch_(char *), dlange_(char *, integer *, + integer *, doublereal *, integer *, doublereal *); + extern /* Subroutine */ int dlarfg_(integer *, doublereal *, doublereal *, + integer *, doublereal *), dlacpy_(char *, integer *, integer *, + doublereal *, integer *, doublereal *, integer *), + dlartg_(doublereal *, doublereal *, doublereal *, doublereal *, + doublereal *), dlarfx_(char *, integer *, integer *, doublereal *, + doublereal *, doublereal *, integer *, doublereal *); + doublereal thresh, smlnum; + + +/* -- LAPACK auxiliary routine (version 3.2) -- */ +/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ +/* November 2006 */ + +/* .. Scalar Arguments .. */ +/* .. */ +/* .. Array Arguments .. */ +/* .. */ + +/* Purpose */ +/* ======= */ + +/* DLAEXC swaps adjacent diagonal blocks T11 and T22 of order 1 or 2 in */ +/* an upper quasi-triangular matrix T by an orthogonal similarity */ +/* transformation. */ + +/* T must be in Schur canonical form, that is, block upper triangular */ +/* with 1-by-1 and 2-by-2 diagonal blocks; each 2-by-2 diagonal block */ +/* has its diagonal elemnts equal and its off-diagonal elements of */ +/* opposite sign. */ + +/* Arguments */ +/* ========= */ + +/* WANTQ (input) LOGICAL */ +/* = .TRUE. : accumulate the transformation in the matrix Q; */ +/* = .FALSE.: do not accumulate the transformation. */ + +/* N (input) INTEGER */ +/* The order of the matrix T. N >= 0. */ + +/* T (input/output) DOUBLE PRECISION array, dimension (LDT,N) */ +/* On entry, the upper quasi-triangular matrix T, in Schur */ +/* canonical form. */ +/* On exit, the updated matrix T, again in Schur canonical form. */ + +/* LDT (input) INTEGER */ +/* The leading dimension of the array T. LDT >= max(1,N). */ + +/* Q (input/output) DOUBLE PRECISION array, dimension (LDQ,N) */ +/* On entry, if WANTQ is .TRUE., the orthogonal matrix Q. */ +/* On exit, if WANTQ is .TRUE., the updated matrix Q. */ +/* If WANTQ is .FALSE., Q is not referenced. */ + +/* LDQ (input) INTEGER */ +/* The leading dimension of the array Q. */ +/* LDQ >= 1; and if WANTQ is .TRUE., LDQ >= N. */ + +/* J1 (input) INTEGER */ +/* The index of the first row of the first block T11. */ + +/* N1 (input) INTEGER */ +/* The order of the first block T11. N1 = 0, 1 or 2. */ + +/* N2 (input) INTEGER */ +/* The order of the second block T22. N2 = 0, 1 or 2. */ + +/* WORK (workspace) DOUBLE PRECISION array, dimension (N) */ + +/* INFO (output) INTEGER */ +/* = 0: successful exit */ +/* = 1: the transformed matrix T would be too far from Schur */ +/* form; the blocks are not swapped and T and Q are */ +/* unchanged. */ + +/* ===================================================================== */ + +/* .. Parameters .. */ +/* .. */ +/* .. Local Scalars .. */ +/* .. */ +/* .. Local Arrays .. */ +/* .. */ +/* .. External Functions .. */ +/* .. */ +/* .. External Subroutines .. */ +/* .. */ +/* .. Intrinsic Functions .. */ +/* .. */ +/* .. Executable Statements .. */ + + /* Parameter adjustments */ + t_dim1 = *ldt; + t_offset = 1 + t_dim1; + t -= t_offset; + q_dim1 = *ldq; + q_offset = 1 + q_dim1; + q -= q_offset; + --work; + + /* Function Body */ + *info = 0; + +/* Quick return if possible */ + + if (*n == 0 || *n1 == 0 || *n2 == 0) { + return 0; + } + if (*j1 + *n1 > *n) { + return 0; + } + + j2 = *j1 + 1; + j3 = *j1 + 2; + j4 = *j1 + 3; + + if (*n1 == 1 && *n2 == 1) { + +/* Swap two 1-by-1 blocks. */ + + t11 = t[*j1 + *j1 * t_dim1]; + t22 = t[j2 + j2 * t_dim1]; + +/* Determine the transformation to perform the interchange. */ + + d__1 = t22 - t11; + dlartg_(&t[*j1 + j2 * t_dim1], &d__1, &cs, &sn, &temp); + +/* Apply transformation to the matrix T. */ + + if (j3 <= *n) { + i__1 = *n - *j1 - 1; + drot_(&i__1, &t[*j1 + j3 * t_dim1], ldt, &t[j2 + j3 * t_dim1], + ldt, &cs, &sn); + } + i__1 = *j1 - 1; + drot_(&i__1, &t[*j1 * t_dim1 + 1], &c__1, &t[j2 * t_dim1 + 1], &c__1, + &cs, &sn); + + t[*j1 + *j1 * t_dim1] = t22; + t[j2 + j2 * t_dim1] = t11; + + if (*wantq) { + +/* Accumulate transformation in the matrix Q. */ + + drot_(n, &q[*j1 * q_dim1 + 1], &c__1, &q[j2 * q_dim1 + 1], &c__1, + &cs, &sn); + } + + } else { + +/* Swapping involves at least one 2-by-2 block. */ + +/* Copy the diagonal block of order N1+N2 to the local array D */ +/* and compute its norm. */ + + nd = *n1 + *n2; + dlacpy_("Full", &nd, &nd, &t[*j1 + *j1 * t_dim1], ldt, d__, &c__4); + dnorm = dlange_("Max", &nd, &nd, d__, &c__4, &work[1]); + +/* Compute machine-dependent threshold for test for accepting */ +/* swap. */ + + eps = dlamch_("P"); + smlnum = dlamch_("S") / eps; +/* Computing MAX */ + d__1 = eps * 10. * dnorm; + thresh = max(d__1,smlnum); + +/* Solve T11*X - X*T22 = scale*T12 for X. */ + + dlasy2_(&c_false, &c_false, &c_n1, n1, n2, d__, &c__4, &d__[*n1 + 1 + + (*n1 + 1 << 2) - 5], &c__4, &d__[(*n1 + 1 << 2) - 4], &c__4, & + scale, x, &c__2, &xnorm, &ierr); + +/* Swap the adjacent diagonal blocks. */ + + k = *n1 + *n1 + *n2 - 3; + switch (k) { + case 1: goto L10; + case 2: goto L20; + case 3: goto L30; + } + +L10: + +/* N1 = 1, N2 = 2: generate elementary reflector H so that: */ + +/* ( scale, X11, X12 ) H = ( 0, 0, * ) */ + + u[0] = scale; + u[1] = x[0]; + u[2] = x[2]; + dlarfg_(&c__3, &u[2], u, &c__1, &tau); + u[2] = 1.; + t11 = t[*j1 + *j1 * t_dim1]; + +/* Perform swap provisionally on diagonal block in D. */ + + dlarfx_("L", &c__3, &c__3, u, &tau, d__, &c__4, &work[1]); + dlarfx_("R", &c__3, &c__3, u, &tau, d__, &c__4, &work[1]); + +/* Test whether to reject swap. */ + +/* Computing MAX */ + d__2 = abs(d__[2]), d__3 = abs(d__[6]), d__2 = max(d__2,d__3), d__3 = + (d__1 = d__[10] - t11, abs(d__1)); + if (max(d__2,d__3) > thresh) { + goto L50; + } + +/* Accept swap: apply transformation to the entire matrix T. */ + + i__1 = *n - *j1 + 1; + dlarfx_("L", &c__3, &i__1, u, &tau, &t[*j1 + *j1 * t_dim1], ldt, & + work[1]); + dlarfx_("R", &j2, &c__3, u, &tau, &t[*j1 * t_dim1 + 1], ldt, &work[1]); + + t[j3 + *j1 * t_dim1] = 0.; + t[j3 + j2 * t_dim1] = 0.; + t[j3 + j3 * t_dim1] = t11; + + if (*wantq) { + +/* Accumulate transformation in the matrix Q. */ + + dlarfx_("R", n, &c__3, u, &tau, &q[*j1 * q_dim1 + 1], ldq, &work[ + 1]); + } + goto L40; + +L20: + +/* N1 = 2, N2 = 1: generate elementary reflector H so that: */ + +/* H ( -X11 ) = ( * ) */ +/* ( -X21 ) = ( 0 ) */ +/* ( scale ) = ( 0 ) */ + + u[0] = -x[0]; + u[1] = -x[1]; + u[2] = scale; + dlarfg_(&c__3, u, &u[1], &c__1, &tau); + u[0] = 1.; + t33 = t[j3 + j3 * t_dim1]; + +/* Perform swap provisionally on diagonal block in D. */ + + dlarfx_("L", &c__3, &c__3, u, &tau, d__, &c__4, &work[1]); + dlarfx_("R", &c__3, &c__3, u, &tau, d__, &c__4, &work[1]); + +/* Test whether to reject swap. */ + +/* Computing MAX */ + d__2 = abs(d__[1]), d__3 = abs(d__[2]), d__2 = max(d__2,d__3), d__3 = + (d__1 = d__[0] - t33, abs(d__1)); + if (max(d__2,d__3) > thresh) { + goto L50; + } + +/* Accept swap: apply transformation to the entire matrix T. */ + + dlarfx_("R", &j3, &c__3, u, &tau, &t[*j1 * t_dim1 + 1], ldt, &work[1]); + i__1 = *n - *j1; + dlarfx_("L", &c__3, &i__1, u, &tau, &t[*j1 + j2 * t_dim1], ldt, &work[ + 1]); + + t[*j1 + *j1 * t_dim1] = t33; + t[j2 + *j1 * t_dim1] = 0.; + t[j3 + *j1 * t_dim1] = 0.; + + if (*wantq) { + +/* Accumulate transformation in the matrix Q. */ + + dlarfx_("R", n, &c__3, u, &tau, &q[*j1 * q_dim1 + 1], ldq, &work[ + 1]); + } + goto L40; + +L30: + +/* N1 = 2, N2 = 2: generate elementary reflectors H(1) and H(2) so */ +/* that: */ + +/* H(2) H(1) ( -X11 -X12 ) = ( * * ) */ +/* ( -X21 -X22 ) ( 0 * ) */ +/* ( scale 0 ) ( 0 0 ) */ +/* ( 0 scale ) ( 0 0 ) */ + + u1[0] = -x[0]; + u1[1] = -x[1]; + u1[2] = scale; + dlarfg_(&c__3, u1, &u1[1], &c__1, &tau1); + u1[0] = 1.; + + temp = -tau1 * (x[2] + u1[1] * x[3]); + u2[0] = -temp * u1[1] - x[3]; + u2[1] = -temp * u1[2]; + u2[2] = scale; + dlarfg_(&c__3, u2, &u2[1], &c__1, &tau2); + u2[0] = 1.; + +/* Perform swap provisionally on diagonal block in D. */ + + dlarfx_("L", &c__3, &c__4, u1, &tau1, d__, &c__4, &work[1]) + ; + dlarfx_("R", &c__4, &c__3, u1, &tau1, d__, &c__4, &work[1]) + ; + dlarfx_("L", &c__3, &c__4, u2, &tau2, &d__[1], &c__4, &work[1]); + dlarfx_("R", &c__4, &c__3, u2, &tau2, &d__[4], &c__4, &work[1]); + +/* Test whether to reject swap. */ + +/* Computing MAX */ + d__1 = abs(d__[2]), d__2 = abs(d__[6]), d__1 = max(d__1,d__2), d__2 = + abs(d__[3]), d__1 = max(d__1,d__2), d__2 = abs(d__[7]); + if (max(d__1,d__2) > thresh) { + goto L50; + } + +/* Accept swap: apply transformation to the entire matrix T. */ + + i__1 = *n - *j1 + 1; + dlarfx_("L", &c__3, &i__1, u1, &tau1, &t[*j1 + *j1 * t_dim1], ldt, & + work[1]); + dlarfx_("R", &j4, &c__3, u1, &tau1, &t[*j1 * t_dim1 + 1], ldt, &work[ + 1]); + i__1 = *n - *j1 + 1; + dlarfx_("L", &c__3, &i__1, u2, &tau2, &t[j2 + *j1 * t_dim1], ldt, & + work[1]); + dlarfx_("R", &j4, &c__3, u2, &tau2, &t[j2 * t_dim1 + 1], ldt, &work[1] +); + + t[j3 + *j1 * t_dim1] = 0.; + t[j3 + j2 * t_dim1] = 0.; + t[j4 + *j1 * t_dim1] = 0.; + t[j4 + j2 * t_dim1] = 0.; + + if (*wantq) { + +/* Accumulate transformation in the matrix Q. */ + + dlarfx_("R", n, &c__3, u1, &tau1, &q[*j1 * q_dim1 + 1], ldq, & + work[1]); + dlarfx_("R", n, &c__3, u2, &tau2, &q[j2 * q_dim1 + 1], ldq, &work[ + 1]); + } + +L40: + + if (*n2 == 2) { + +/* Standardize new 2-by-2 block T11 */ + + dlanv2_(&t[*j1 + *j1 * t_dim1], &t[*j1 + j2 * t_dim1], &t[j2 + * + j1 * t_dim1], &t[j2 + j2 * t_dim1], &wr1, &wi1, &wr2, & + wi2, &cs, &sn); + i__1 = *n - *j1 - 1; + drot_(&i__1, &t[*j1 + (*j1 + 2) * t_dim1], ldt, &t[j2 + (*j1 + 2) + * t_dim1], ldt, &cs, &sn); + i__1 = *j1 - 1; + drot_(&i__1, &t[*j1 * t_dim1 + 1], &c__1, &t[j2 * t_dim1 + 1], & + c__1, &cs, &sn); + if (*wantq) { + drot_(n, &q[*j1 * q_dim1 + 1], &c__1, &q[j2 * q_dim1 + 1], & + c__1, &cs, &sn); + } + } + + if (*n1 == 2) { + +/* Standardize new 2-by-2 block T22 */ + + j3 = *j1 + *n2; + j4 = j3 + 1; + dlanv2_(&t[j3 + j3 * t_dim1], &t[j3 + j4 * t_dim1], &t[j4 + j3 * + t_dim1], &t[j4 + j4 * t_dim1], &wr1, &wi1, &wr2, &wi2, & + cs, &sn); + if (j3 + 2 <= *n) { + i__1 = *n - j3 - 1; + drot_(&i__1, &t[j3 + (j3 + 2) * t_dim1], ldt, &t[j4 + (j3 + 2) + * t_dim1], ldt, &cs, &sn); + } + i__1 = j3 - 1; + drot_(&i__1, &t[j3 * t_dim1 + 1], &c__1, &t[j4 * t_dim1 + 1], & + c__1, &cs, &sn); + if (*wantq) { + drot_(n, &q[j3 * q_dim1 + 1], &c__1, &q[j4 * q_dim1 + 1], & + c__1, &cs, &sn); + } + } + + } + return 0; + +/* Exit with INFO = 1 if swap was rejected. */ + +L50: + *info = 1; + return 0; + +/* End of DLAEXC */ + +} /* dlaexc_ */ |