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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/dpttrs.c | |
parent | 01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff) | |
download | ydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz |
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/dpttrs.c')
-rw-r--r-- | contrib/libs/clapack/dpttrs.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/contrib/libs/clapack/dpttrs.c b/contrib/libs/clapack/dpttrs.c new file mode 100644 index 0000000000..52aaa90560 --- /dev/null +++ b/contrib/libs/clapack/dpttrs.c @@ -0,0 +1,156 @@ +/* dpttrs.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_n1 = -1; + +/* Subroutine */ int dpttrs_(integer *n, integer *nrhs, doublereal *d__, + doublereal *e, doublereal *b, integer *ldb, integer *info) +{ + /* System generated locals */ + integer b_dim1, b_offset, i__1, i__2, i__3; + + /* Local variables */ + integer j, jb, nb; + extern /* Subroutine */ int dptts2_(integer *, integer *, doublereal *, + doublereal *, doublereal *, integer *), xerbla_(char *, integer *); + extern integer ilaenv_(integer *, char *, char *, integer *, integer *, + integer *, integer *); + + +/* -- LAPACK routine (version 3.2) -- */ +/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ +/* November 2006 */ + +/* .. Scalar Arguments .. */ +/* .. */ +/* .. Array Arguments .. */ +/* .. */ + +/* Purpose */ +/* ======= */ + +/* DPTTRS solves a tridiagonal system of the form */ +/* A * X = B */ +/* using the L*D*L' factorization of A computed by DPTTRF. D is a */ +/* diagonal matrix specified in the vector D, L is a unit bidiagonal */ +/* matrix whose subdiagonal is specified in the vector E, and X and B */ +/* are N by NRHS matrices. */ + +/* Arguments */ +/* ========= */ + +/* N (input) INTEGER */ +/* The order of the tridiagonal matrix A. N >= 0. */ + +/* NRHS (input) INTEGER */ +/* The number of right hand sides, i.e., the number of columns */ +/* of the matrix B. NRHS >= 0. */ + +/* D (input) DOUBLE PRECISION array, dimension (N) */ +/* The n diagonal elements of the diagonal matrix D from the */ +/* L*D*L' factorization of A. */ + +/* E (input) DOUBLE PRECISION array, dimension (N-1) */ +/* The (n-1) subdiagonal elements of the unit bidiagonal factor */ +/* L from the L*D*L' factorization of A. E can also be regarded */ +/* as the superdiagonal of the unit bidiagonal factor U from the */ +/* factorization A = U'*D*U. */ + +/* B (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS) */ +/* On entry, the right hand side vectors B for the system of */ +/* linear equations. */ +/* On exit, the solution vectors, X. */ + +/* LDB (input) INTEGER */ +/* The leading dimension of the array B. LDB >= max(1,N). */ + +/* INFO (output) INTEGER */ +/* = 0: successful exit */ +/* < 0: if INFO = -k, the k-th argument had an illegal value */ + +/* ===================================================================== */ + +/* .. Local Scalars .. */ +/* .. */ +/* .. External Functions .. */ +/* .. */ +/* .. External Subroutines .. */ +/* .. */ +/* .. Intrinsic Functions .. */ +/* .. */ +/* .. Executable Statements .. */ + +/* Test the input arguments. */ + + /* Parameter adjustments */ + --d__; + --e; + b_dim1 = *ldb; + b_offset = 1 + b_dim1; + b -= b_offset; + + /* Function Body */ + *info = 0; + if (*n < 0) { + *info = -1; + } else if (*nrhs < 0) { + *info = -2; + } else if (*ldb < max(1,*n)) { + *info = -6; + } + if (*info != 0) { + i__1 = -(*info); + xerbla_("DPTTRS", &i__1); + return 0; + } + +/* Quick return if possible */ + + if (*n == 0 || *nrhs == 0) { + return 0; + } + +/* Determine the number of right-hand sides to solve at a time. */ + + if (*nrhs == 1) { + nb = 1; + } else { +/* Computing MAX */ + i__1 = 1, i__2 = ilaenv_(&c__1, "DPTTRS", " ", n, nrhs, &c_n1, &c_n1); + nb = max(i__1,i__2); + } + + if (nb >= *nrhs) { + dptts2_(n, nrhs, &d__[1], &e[1], &b[b_offset], ldb); + } else { + i__1 = *nrhs; + i__2 = nb; + for (j = 1; i__2 < 0 ? j >= i__1 : j <= i__1; j += i__2) { +/* Computing MIN */ + i__3 = *nrhs - j + 1; + jb = min(i__3,nb); + dptts2_(n, &jb, &d__[1], &e[1], &b[j * b_dim1 + 1], ldb); +/* L10: */ + } + } + + return 0; + +/* End of DPTTRS */ + +} /* dpttrs_ */ |