diff options
| author | shmel1k <[email protected]> | 2022-09-02 12:44:59 +0300 |
|---|---|---|
| committer | shmel1k <[email protected]> | 2022-09-02 12:44:59 +0300 |
| commit | 90d450f74722da7859d6f510a869f6c6908fd12f (patch) | |
| tree | 538c718dedc76cdfe37ad6d01ff250dd930d9278 /contrib/libs/clapack/zgecon.c | |
| parent | 01f64c1ecd0d4ffa9e3a74478335f1745f26cc75 (diff) | |
[] add metering mode to CLI
Diffstat (limited to 'contrib/libs/clapack/zgecon.c')
| -rw-r--r-- | contrib/libs/clapack/zgecon.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/contrib/libs/clapack/zgecon.c b/contrib/libs/clapack/zgecon.c new file mode 100644 index 00000000000..894ab735cc9 --- /dev/null +++ b/contrib/libs/clapack/zgecon.c @@ -0,0 +1,235 @@ +/* zgecon.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; + +/* Subroutine */ int zgecon_(char *norm, integer *n, doublecomplex *a, + integer *lda, doublereal *anorm, doublereal *rcond, doublecomplex * + work, doublereal *rwork, integer *info) +{ + /* System generated locals */ + integer a_dim1, a_offset, i__1; + doublereal d__1, d__2; + + /* Builtin functions */ + double d_imag(doublecomplex *); + + /* Local variables */ + doublereal sl; + integer ix; + doublereal su; + integer kase, kase1; + doublereal scale; + extern logical lsame_(char *, char *); + integer isave[3]; + extern /* Subroutine */ int zlacn2_(integer *, doublecomplex *, + doublecomplex *, doublereal *, integer *, integer *); + extern doublereal dlamch_(char *); + extern /* Subroutine */ int xerbla_(char *, integer *); + doublereal ainvnm; + extern integer izamax_(integer *, doublecomplex *, integer *); + logical onenrm; + extern /* Subroutine */ int zdrscl_(integer *, doublereal *, + doublecomplex *, integer *); + char normin[1]; + doublereal smlnum; + extern /* Subroutine */ int zlatrs_(char *, char *, char *, char *, + integer *, doublecomplex *, integer *, doublecomplex *, + doublereal *, doublereal *, integer *); + + +/* -- LAPACK routine (version 3.2) -- */ +/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ +/* November 2006 */ + +/* Modified to call ZLACN2 in place of ZLACON, 10 Feb 03, SJH. */ + +/* .. Scalar Arguments .. */ +/* .. */ +/* .. Array Arguments .. */ +/* .. */ + +/* Purpose */ +/* ======= */ + +/* ZGECON estimates the reciprocal of the condition number of a general */ +/* complex matrix A, in either the 1-norm or the infinity-norm, using */ +/* the LU factorization computed by ZGETRF. */ + +/* An estimate is obtained for norm(inv(A)), and the reciprocal of the */ +/* condition number is computed as */ +/* RCOND = 1 / ( norm(A) * norm(inv(A)) ). */ + +/* Arguments */ +/* ========= */ + +/* NORM (input) CHARACTER*1 */ +/* Specifies whether the 1-norm condition number or the */ +/* infinity-norm condition number is required: */ +/* = '1' or 'O': 1-norm; */ +/* = 'I': Infinity-norm. */ + +/* N (input) INTEGER */ +/* The order of the matrix A. N >= 0. */ + +/* A (input) COMPLEX*16 array, dimension (LDA,N) */ +/* The factors L and U from the factorization A = P*L*U */ +/* as computed by ZGETRF. */ + +/* LDA (input) INTEGER */ +/* The leading dimension of the array A. LDA >= max(1,N). */ + +/* ANORM (input) DOUBLE PRECISION */ +/* If NORM = '1' or 'O', the 1-norm of the original matrix A. */ +/* If NORM = 'I', the infinity-norm of the original matrix A. */ + +/* RCOND (output) DOUBLE PRECISION */ +/* The reciprocal of the condition number of the matrix A, */ +/* computed as RCOND = 1/(norm(A) * norm(inv(A))). */ + +/* WORK (workspace) COMPLEX*16 array, dimension (2*N) */ + +/* RWORK (workspace) DOUBLE PRECISION array, dimension (2*N) */ + +/* INFO (output) INTEGER */ +/* = 0: successful exit */ +/* < 0: if INFO = -i, the i-th argument had an illegal value */ + +/* ===================================================================== */ + +/* .. Parameters .. */ +/* .. */ +/* .. Local Scalars .. */ +/* .. */ +/* .. Local Arrays .. */ +/* .. */ +/* .. External Functions .. */ +/* .. */ +/* .. External Subroutines .. */ +/* .. */ +/* .. Intrinsic Functions .. */ +/* .. */ +/* .. Statement Functions .. */ +/* .. */ +/* .. Statement Function definitions .. */ +/* .. */ +/* .. Executable Statements .. */ + +/* Test the input parameters. */ + + /* Parameter adjustments */ + a_dim1 = *lda; + a_offset = 1 + a_dim1; + a -= a_offset; + --work; + --rwork; + + /* Function Body */ + *info = 0; + onenrm = *(unsigned char *)norm == '1' || lsame_(norm, "O"); + if (! onenrm && ! lsame_(norm, "I")) { + *info = -1; + } else if (*n < 0) { + *info = -2; + } else if (*lda < max(1,*n)) { + *info = -4; + } else if (*anorm < 0.) { + *info = -5; + } + if (*info != 0) { + i__1 = -(*info); + xerbla_("ZGECON", &i__1); + return 0; + } + +/* Quick return if possible */ + + *rcond = 0.; + if (*n == 0) { + *rcond = 1.; + return 0; + } else if (*anorm == 0.) { + return 0; + } + + smlnum = dlamch_("Safe minimum"); + +/* Estimate the norm of inv(A). */ + + ainvnm = 0.; + *(unsigned char *)normin = 'N'; + if (onenrm) { + kase1 = 1; + } else { + kase1 = 2; + } + kase = 0; +L10: + zlacn2_(n, &work[*n + 1], &work[1], &ainvnm, &kase, isave); + if (kase != 0) { + if (kase == kase1) { + +/* Multiply by inv(L). */ + + zlatrs_("Lower", "No transpose", "Unit", normin, n, &a[a_offset], + lda, &work[1], &sl, &rwork[1], info); + +/* Multiply by inv(U). */ + + zlatrs_("Upper", "No transpose", "Non-unit", normin, n, &a[ + a_offset], lda, &work[1], &su, &rwork[*n + 1], info); + } else { + +/* Multiply by inv(U'). */ + + zlatrs_("Upper", "Conjugate transpose", "Non-unit", normin, n, &a[ + a_offset], lda, &work[1], &su, &rwork[*n + 1], info); + +/* Multiply by inv(L'). */ + + zlatrs_("Lower", "Conjugate transpose", "Unit", normin, n, &a[ + a_offset], lda, &work[1], &sl, &rwork[1], info); + } + +/* Divide X by 1/(SL*SU) if doing so will not cause overflow. */ + + scale = sl * su; + *(unsigned char *)normin = 'Y'; + if (scale != 1.) { + ix = izamax_(n, &work[1], &c__1); + i__1 = ix; + if (scale < ((d__1 = work[i__1].r, abs(d__1)) + (d__2 = d_imag(& + work[ix]), abs(d__2))) * smlnum || scale == 0.) { + goto L20; + } + zdrscl_(n, &scale, &work[1], &c__1); + } + goto L10; + } + +/* Compute the estimate of the reciprocal condition number. */ + + if (ainvnm != 0.) { + *rcond = 1. / ainvnm / *anorm; + } + +L20: + return 0; + +/* End of ZGECON */ + +} /* zgecon_ */ |
