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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/dgttrs.c | |
parent | 01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff) | |
download | ydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz |
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/dgttrs.c')
-rw-r--r-- | contrib/libs/clapack/dgttrs.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/contrib/libs/clapack/dgttrs.c b/contrib/libs/clapack/dgttrs.c new file mode 100644 index 0000000000..7b4c5b3e2a --- /dev/null +++ b/contrib/libs/clapack/dgttrs.c @@ -0,0 +1,189 @@ +/* dgttrs.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 dgttrs_(char *trans, integer *n, integer *nrhs, + doublereal *dl, doublereal *d__, doublereal *du, doublereal *du2, + integer *ipiv, 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 dgtts2_(integer *, integer *, integer *, + doublereal *, doublereal *, doublereal *, doublereal *, integer *, + doublereal *, integer *), xerbla_(char *, integer *); + extern integer ilaenv_(integer *, char *, char *, integer *, integer *, + integer *, integer *); + integer itrans; + logical notran; + + +/* -- LAPACK routine (version 3.2) -- */ +/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ +/* November 2006 */ + +/* .. Scalar Arguments .. */ +/* .. */ +/* .. Array Arguments .. */ +/* .. */ + +/* Purpose */ +/* ======= */ + +/* DGTTRS solves one of the systems of equations */ +/* A*X = B or A'*X = B, */ +/* with a tridiagonal matrix A using the LU factorization computed */ +/* by DGTTRF. */ + +/* Arguments */ +/* ========= */ + +/* TRANS (input) CHARACTER*1 */ +/* Specifies the form of the system of equations. */ +/* = 'N': A * X = B (No transpose) */ +/* = 'T': A'* X = B (Transpose) */ +/* = 'C': A'* X = B (Conjugate transpose = Transpose) */ + +/* N (input) INTEGER */ +/* The order of the matrix A. */ + +/* NRHS (input) INTEGER */ +/* The number of right hand sides, i.e., the number of columns */ +/* of the matrix B. NRHS >= 0. */ + +/* DL (input) DOUBLE PRECISION array, dimension (N-1) */ +/* The (n-1) multipliers that define the matrix L from the */ +/* LU factorization of A. */ + +/* D (input) DOUBLE PRECISION array, dimension (N) */ +/* The n diagonal elements of the upper triangular matrix U from */ +/* the LU factorization of A. */ + +/* DU (input) DOUBLE PRECISION array, dimension (N-1) */ +/* The (n-1) elements of the first super-diagonal of U. */ + +/* DU2 (input) DOUBLE PRECISION array, dimension (N-2) */ +/* The (n-2) elements of the second super-diagonal of U. */ + +/* IPIV (input) INTEGER array, dimension (N) */ +/* The pivot indices; for 1 <= i <= n, row i of the matrix was */ +/* interchanged with row IPIV(i). IPIV(i) will always be either */ +/* i or i+1; IPIV(i) = i indicates a row interchange was not */ +/* required. */ + +/* B (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS) */ +/* On entry, the matrix of right hand side vectors B. */ +/* On exit, B is overwritten by 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 = -i, the i-th argument had an illegal value */ + +/* ===================================================================== */ + +/* .. Local Scalars .. */ +/* .. */ +/* .. External Functions .. */ +/* .. */ +/* .. External Subroutines .. */ +/* .. */ +/* .. Intrinsic Functions .. */ +/* .. */ +/* .. Executable Statements .. */ + + /* Parameter adjustments */ + --dl; + --d__; + --du; + --du2; + --ipiv; + b_dim1 = *ldb; + b_offset = 1 + b_dim1; + b -= b_offset; + + /* Function Body */ + *info = 0; + notran = *(unsigned char *)trans == 'N' || *(unsigned char *)trans == 'n'; + if (! notran && ! (*(unsigned char *)trans == 'T' || *(unsigned char *) + trans == 't') && ! (*(unsigned char *)trans == 'C' || *(unsigned + char *)trans == 'c')) { + *info = -1; + } else if (*n < 0) { + *info = -2; + } else if (*nrhs < 0) { + *info = -3; + } else if (*ldb < max(*n,1)) { + *info = -10; + } + if (*info != 0) { + i__1 = -(*info); + xerbla_("DGTTRS", &i__1); + return 0; + } + +/* Quick return if possible */ + + if (*n == 0 || *nrhs == 0) { + return 0; + } + +/* Decode TRANS */ + + if (notran) { + itrans = 0; + } else { + itrans = 1; + } + +/* 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, "DGTTRS", trans, n, nrhs, &c_n1, & + c_n1); + nb = max(i__1,i__2); + } + + if (nb >= *nrhs) { + dgtts2_(&itrans, n, nrhs, &dl[1], &d__[1], &du[1], &du2[1], &ipiv[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); + dgtts2_(&itrans, n, &jb, &dl[1], &d__[1], &du[1], &du2[1], &ipiv[ + 1], &b[j * b_dim1 + 1], ldb); +/* L10: */ + } + } + +/* End of DGTTRS */ + + return 0; +} /* dgttrs_ */ |