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authorshmel1k <shmel1k@ydb.tech>2022-09-02 12:44:59 +0300
committershmel1k <shmel1k@ydb.tech>2022-09-02 12:44:59 +0300
commit90d450f74722da7859d6f510a869f6c6908fd12f (patch)
tree538c718dedc76cdfe37ad6d01ff250dd930d9278 /contrib/libs/clapack/sptsv.c
parent01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff)
downloadydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/sptsv.c')
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diff --git a/contrib/libs/clapack/sptsv.c b/contrib/libs/clapack/sptsv.c
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+/* 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_ */