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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/cpbsv.c | |
parent | 01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff) | |
download | ydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz |
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/cpbsv.c')
-rw-r--r-- | contrib/libs/clapack/cpbsv.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/contrib/libs/clapack/cpbsv.c b/contrib/libs/clapack/cpbsv.c new file mode 100644 index 0000000000..4b59d799c4 --- /dev/null +++ b/contrib/libs/clapack/cpbsv.c @@ -0,0 +1,182 @@ +/* cpbsv.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 cpbsv_(char *uplo, integer *n, integer *kd, integer * + nrhs, complex *ab, integer *ldab, complex *b, integer *ldb, integer * + info) +{ + /* System generated locals */ + integer ab_dim1, ab_offset, b_dim1, b_offset, i__1; + + /* Local variables */ + extern logical lsame_(char *, char *); + extern /* Subroutine */ int xerbla_(char *, integer *), cpbtrf_( + char *, integer *, integer *, complex *, integer *, integer *), cpbtrs_(char *, integer *, integer *, integer *, complex + *, integer *, complex *, integer *, integer *); + + +/* -- LAPACK driver routine (version 3.2) -- */ +/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ +/* November 2006 */ + +/* .. Scalar Arguments .. */ +/* .. */ +/* .. Array Arguments .. */ +/* .. */ + +/* Purpose */ +/* ======= */ + +/* CPBSV computes the solution to a complex system of linear equations */ +/* A * X = B, */ +/* where A is an N-by-N Hermitian positive definite band matrix and X */ +/* and B are N-by-NRHS matrices. */ + +/* The Cholesky decomposition is used to factor A as */ +/* A = U**H * U, if UPLO = 'U', or */ +/* A = L * L**H, if UPLO = 'L', */ +/* where U is an upper triangular band matrix, and L is a lower */ +/* triangular band matrix, with the same number of superdiagonals or */ +/* subdiagonals as A. The factored form of A is then used to solve the */ +/* system of equations A * X = B. */ + +/* Arguments */ +/* ========= */ + +/* UPLO (input) CHARACTER*1 */ +/* = 'U': Upper triangle of A is stored; */ +/* = 'L': Lower triangle of A is stored. */ + +/* N (input) INTEGER */ +/* The number of linear equations, i.e., the order of the */ +/* matrix A. N >= 0. */ + +/* KD (input) INTEGER */ +/* The number of superdiagonals of the matrix A if UPLO = 'U', */ +/* or the number of subdiagonals if UPLO = 'L'. KD >= 0. */ + +/* NRHS (input) INTEGER */ +/* The number of right hand sides, i.e., the number of columns */ +/* of the matrix B. NRHS >= 0. */ + +/* AB (input/output) COMPLEX array, dimension (LDAB,N) */ +/* On entry, the upper or lower triangle of the Hermitian band */ +/* matrix A, stored in the first KD+1 rows of the array. The */ +/* j-th column of A is stored in the j-th column of the array AB */ +/* as follows: */ +/* if UPLO = 'U', AB(KD+1+i-j,j) = A(i,j) for max(1,j-KD)<=i<=j; */ +/* if UPLO = 'L', AB(1+i-j,j) = A(i,j) for j<=i<=min(N,j+KD). */ +/* See below for further details. */ + +/* On exit, if INFO = 0, the triangular factor U or L from the */ +/* Cholesky factorization A = U**H*U or A = L*L**H of the band */ +/* matrix A, in the same storage format as A. */ + +/* LDAB (input) INTEGER */ +/* The leading dimension of the array AB. LDAB >= KD+1. */ + +/* B (input/output) COMPLEX 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 of A is not */ +/* positive definite, so the factorization could not be */ +/* completed, and the solution has not been computed. */ + +/* Further Details */ +/* =============== */ + +/* The band storage scheme is illustrated by the following example, when */ +/* N = 6, KD = 2, and UPLO = 'U': */ + +/* On entry: On exit: */ + +/* * * a13 a24 a35 a46 * * u13 u24 u35 u46 */ +/* * a12 a23 a34 a45 a56 * u12 u23 u34 u45 u56 */ +/* a11 a22 a33 a44 a55 a66 u11 u22 u33 u44 u55 u66 */ + +/* Similarly, if UPLO = 'L' the format of A is as follows: */ + +/* On entry: On exit: */ + +/* a11 a22 a33 a44 a55 a66 l11 l22 l33 l44 l55 l66 */ +/* a21 a32 a43 a54 a65 * l21 l32 l43 l54 l65 * */ +/* a31 a42 a53 a64 * * l31 l42 l53 l64 * * */ + +/* Array elements marked * are not used by the routine. */ + +/* ===================================================================== */ + +/* .. External Functions .. */ +/* .. */ +/* .. External Subroutines .. */ +/* .. */ +/* .. Intrinsic Functions .. */ +/* .. */ +/* .. Executable Statements .. */ + +/* Test the input parameters. */ + + /* Parameter adjustments */ + ab_dim1 = *ldab; + ab_offset = 1 + ab_dim1; + ab -= ab_offset; + b_dim1 = *ldb; + b_offset = 1 + b_dim1; + b -= b_offset; + + /* Function Body */ + *info = 0; + if (! lsame_(uplo, "U") && ! lsame_(uplo, "L")) { + *info = -1; + } else if (*n < 0) { + *info = -2; + } else if (*kd < 0) { + *info = -3; + } else if (*nrhs < 0) { + *info = -4; + } else if (*ldab < *kd + 1) { + *info = -6; + } else if (*ldb < max(1,*n)) { + *info = -8; + } + if (*info != 0) { + i__1 = -(*info); + xerbla_("CPBSV ", &i__1); + return 0; + } + +/* Compute the Cholesky factorization A = U'*U or A = L*L'. */ + + cpbtrf_(uplo, n, kd, &ab[ab_offset], ldab, info); + if (*info == 0) { + +/* Solve the system A*X = B, overwriting B with X. */ + + cpbtrs_(uplo, n, kd, nrhs, &ab[ab_offset], ldab, &b[b_offset], ldb, + info); + + } + return 0; + +/* End of CPBSV */ + +} /* cpbsv_ */ |