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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/sgetc2.c | |
parent | 01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff) | |
download | ydb-90d450f74722da7859d6f510a869f6c6908fd12f.tar.gz |
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/sgetc2.c')
-rw-r--r-- | contrib/libs/clapack/sgetc2.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/contrib/libs/clapack/sgetc2.c b/contrib/libs/clapack/sgetc2.c new file mode 100644 index 0000000000..5c375cb113 --- /dev/null +++ b/contrib/libs/clapack/sgetc2.c @@ -0,0 +1,198 @@ +/* sgetc2.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 real c_b10 = -1.f; + +/* Subroutine */ int sgetc2_(integer *n, real *a, integer *lda, integer *ipiv, + integer *jpiv, integer *info) +{ + /* System generated locals */ + integer a_dim1, a_offset, i__1, i__2, i__3; + real r__1; + + /* Local variables */ + integer i__, j, ip, jp; + real eps; + integer ipv, jpv; + extern /* Subroutine */ int sger_(integer *, integer *, real *, real *, + integer *, real *, integer *, real *, integer *); + real smin, xmax; + extern /* Subroutine */ int sswap_(integer *, real *, integer *, real *, + integer *), slabad_(real *, real *); + extern doublereal slamch_(char *); + real bignum, smlnum; + + +/* -- LAPACK auxiliary routine (version 3.2) -- */ +/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ +/* November 2006 */ + +/* .. Scalar Arguments .. */ +/* .. */ +/* .. Array Arguments .. */ +/* .. */ + +/* Purpose */ +/* ======= */ + +/* SGETC2 computes an LU factorization with complete pivoting of the */ +/* n-by-n matrix A. The factorization has the form A = P * L * U * Q, */ +/* where P and Q are permutation matrices, L is lower triangular with */ +/* unit diagonal elements and U is upper triangular. */ + +/* This is the Level 2 BLAS algorithm. */ + +/* Arguments */ +/* ========= */ + +/* N (input) INTEGER */ +/* The order of the matrix A. N >= 0. */ + +/* A (input/output) REAL array, dimension (LDA, N) */ +/* On entry, the n-by-n matrix A to be factored. */ +/* On exit, the factors L and U from the factorization */ +/* A = P*L*U*Q; the unit diagonal elements of L are not stored. */ +/* If U(k, k) appears to be less than SMIN, U(k, k) is given the */ +/* value of SMIN, i.e., giving a nonsingular perturbed system. */ + +/* LDA (input) INTEGER */ +/* The leading dimension of the array A. LDA >= max(1,N). */ + +/* IPIV (output) INTEGER array, dimension(N). */ +/* The pivot indices; for 1 <= i <= N, row i of the */ +/* matrix has been interchanged with row IPIV(i). */ + +/* JPIV (output) INTEGER array, dimension(N). */ +/* The pivot indices; for 1 <= j <= N, column j of the */ +/* matrix has been interchanged with column JPIV(j). */ + +/* INFO (output) INTEGER */ +/* = 0: successful exit */ +/* > 0: if INFO = k, U(k, k) is likely to produce owerflow if */ +/* we try to solve for x in Ax = b. So U is perturbed to */ +/* avoid the overflow. */ + +/* Further Details */ +/* =============== */ + +/* Based on contributions by */ +/* Bo Kagstrom and Peter Poromaa, Department of Computing Science, */ +/* Umea University, S-901 87 Umea, Sweden. */ + +/* ===================================================================== */ + +/* .. Parameters .. */ +/* .. */ +/* .. Local Scalars .. */ +/* .. */ +/* .. External Subroutines .. */ +/* .. */ +/* .. External Functions .. */ +/* .. */ +/* .. Intrinsic Functions .. */ +/* .. */ +/* .. Executable Statements .. */ + +/* Set constants to control overflow */ + + /* Parameter adjustments */ + a_dim1 = *lda; + a_offset = 1 + a_dim1; + a -= a_offset; + --ipiv; + --jpiv; + + /* Function Body */ + *info = 0; + eps = slamch_("P"); + smlnum = slamch_("S") / eps; + bignum = 1.f / smlnum; + slabad_(&smlnum, &bignum); + +/* Factorize A using complete pivoting. */ +/* Set pivots less than SMIN to SMIN. */ + + i__1 = *n - 1; + for (i__ = 1; i__ <= i__1; ++i__) { + +/* Find max element in matrix A */ + + xmax = 0.f; + i__2 = *n; + for (ip = i__; ip <= i__2; ++ip) { + i__3 = *n; + for (jp = i__; jp <= i__3; ++jp) { + if ((r__1 = a[ip + jp * a_dim1], dabs(r__1)) >= xmax) { + xmax = (r__1 = a[ip + jp * a_dim1], dabs(r__1)); + ipv = ip; + jpv = jp; + } +/* L10: */ + } +/* L20: */ + } + if (i__ == 1) { +/* Computing MAX */ + r__1 = eps * xmax; + smin = dmax(r__1,smlnum); + } + +/* Swap rows */ + + if (ipv != i__) { + sswap_(n, &a[ipv + a_dim1], lda, &a[i__ + a_dim1], lda); + } + ipiv[i__] = ipv; + +/* Swap columns */ + + if (jpv != i__) { + sswap_(n, &a[jpv * a_dim1 + 1], &c__1, &a[i__ * a_dim1 + 1], & + c__1); + } + jpiv[i__] = jpv; + +/* Check for singularity */ + + if ((r__1 = a[i__ + i__ * a_dim1], dabs(r__1)) < smin) { + *info = i__; + a[i__ + i__ * a_dim1] = smin; + } + i__2 = *n; + for (j = i__ + 1; j <= i__2; ++j) { + a[j + i__ * a_dim1] /= a[i__ + i__ * a_dim1]; +/* L30: */ + } + i__2 = *n - i__; + i__3 = *n - i__; + sger_(&i__2, &i__3, &c_b10, &a[i__ + 1 + i__ * a_dim1], &c__1, &a[i__ + + (i__ + 1) * a_dim1], lda, &a[i__ + 1 + (i__ + 1) * a_dim1], + lda); +/* L40: */ + } + + if ((r__1 = a[*n + *n * a_dim1], dabs(r__1)) < smin) { + *info = *n; + a[*n + *n * a_dim1] = smin; + } + + return 0; + +/* End of SGETC2 */ + +} /* sgetc2_ */ |