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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/sptsv.c | |
parent | 01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff) | |
download | ydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz |
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/sptsv.c')
-rw-r--r-- | contrib/libs/clapack/sptsv.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/contrib/libs/clapack/sptsv.c b/contrib/libs/clapack/sptsv.c new file mode 100644 index 0000000000..f39fe1e390 --- /dev/null +++ b/contrib/libs/clapack/sptsv.c @@ -0,0 +1,129 @@ +/* sptsv.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" + +/* Subroutine */ int sptsv_(integer *n, integer *nrhs, real *d__, real *e, + real *b, integer *ldb, integer *info) +{ + /* System generated locals */ + integer b_dim1, b_offset, i__1; + + /* Local variables */ + extern /* Subroutine */ int xerbla_(char *, integer *), spttrf_( + integer *, real *, real *, integer *), spttrs_(integer *, integer + *, real *, real *, real *, integer *, integer *); + + +/* -- LAPACK routine (version 3.2) -- */ +/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ +/* November 2006 */ + +/* .. Scalar Arguments .. */ +/* .. */ +/* .. Array Arguments .. */ +/* .. */ + +/* Purpose */ +/* ======= */ + +/* SPTSV computes the solution to a real system of linear equations */ +/* A*X = B, where A is an N-by-N symmetric positive definite tridiagonal */ +/* matrix, and X and B are N-by-NRHS matrices. */ + +/* A is factored as A = L*D*L**T, and the factored form of A is then */ +/* used to solve the system of equations. */ + +/* Arguments */ +/* ========= */ + +/* N (input) INTEGER */ +/* The order of the 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/output) REAL array, dimension (N) */ +/* On entry, the n diagonal elements of the tridiagonal matrix */ +/* A. On exit, the n diagonal elements of the diagonal matrix */ +/* D from the factorization A = L*D*L**T. */ + +/* E (input/output) REAL array, dimension (N-1) */ +/* On entry, the (n-1) subdiagonal elements of the tridiagonal */ +/* matrix A. On exit, the (n-1) subdiagonal elements of the */ +/* unit bidiagonal factor L from the L*D*L**T factorization of */ +/* A. (E can also be regarded as the superdiagonal of the unit */ +/* bidiagonal factor U from the U**T*D*U factorization of A.) */ + +/* B (input/output) REAL array, dimension (LDB,NRHS) */ +/* On entry, the N-by-NRHS right hand side matrix B. */ +/* On exit, if INFO = 0, the N-by-NRHS solution matrix X. */ + +/* LDB (input) INTEGER */ +/* The leading dimension of the array B. LDB >= max(1,N). */ + +/* INFO (output) INTEGER */ +/* = 0: successful exit */ +/* < 0: if INFO = -i, the i-th argument had an illegal value */ +/* > 0: if INFO = i, the leading minor of order i is not */ +/* positive definite, and the solution has not been */ +/* computed. The factorization has not been completed */ +/* unless i = N. */ + +/* ===================================================================== */ + +/* .. External Subroutines .. */ +/* .. */ +/* .. Intrinsic Functions .. */ +/* .. */ +/* .. Executable Statements .. */ + +/* Test the input parameters. */ + + /* 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_("SPTSV ", &i__1); + return 0; + } + +/* Compute the L*D*L' (or U'*D*U) factorization of A. */ + + spttrf_(n, &d__[1], &e[1], info); + if (*info == 0) { + +/* Solve the system A*X = B, overwriting B with X. */ + + spttrs_(n, nrhs, &d__[1], &e[1], &b[b_offset], ldb, info); + } + return 0; + +/* End of SPTSV */ + +} /* sptsv_ */ |