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/* ../SRC/dnconv.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"
/* Common Block Declarations */
struct {
integer logfil, ndigit, mgetv0, msaupd, msaup2, msaitr, mseigt, msapps,
msgets, mseupd, mnaupd, mnaup2, mnaitr, mneigh, mnapps, mngets,
mneupd, mcaupd, mcaup2, mcaitr, mceigh, mcapps, mcgets, mceupd;
} debug_;
#define debug_1 debug_
struct {
integer nopx, nbx, nrorth, nitref, nrstrt;
real tsaupd, tsaup2, tsaitr, tseigt, tsgets, tsapps, tsconv, tnaupd,
tnaup2, tnaitr, tneigh, tngets, tnapps, tnconv, tcaupd, tcaup2,
tcaitr, tceigh, tcgets, tcapps, tcconv, tmvopx, tmvbx, tgetv0,
titref, trvec;
} timing_;
#define timing_1 timing_
/* Table of constant values */
static doublereal c_b3 = .66666666666666663;
/* ----------------------------------------------------------------------- */
/* \BeginDoc */
/* \Name: dnconv */
/* \Description: */
/* Convergence testing for the nonsymmetric Arnoldi eigenvalue routine. */
/* \Usage: */
/* call dnconv */
/* ( N, RITZR, RITZI, BOUNDS, TOL, NCONV ) */
/* \Arguments */
/* N Integer. (INPUT) */
/* Number of Ritz values to check for convergence. */
/* RITZR, Double precision arrays of length N. (INPUT) */
/* RITZI Real and imaginary parts of the Ritz values to be checked */
/* for convergence. */
/* BOUNDS Double precision array of length N. (INPUT) */
/* Ritz estimates for the Ritz values in RITZR and RITZI. */
/* TOL Double precision scalar. (INPUT) */
/* Desired backward error for a Ritz value to be considered */
/* "converged". */
/* NCONV Integer scalar. (OUTPUT) */
/* Number of "converged" Ritz values. */
/* \EndDoc */
/* ----------------------------------------------------------------------- */
/* \BeginLib */
/* \Local variables: */
/* xxxxxx real */
/* \Routines called: */
/* second ARPACK utility routine for timing. */
/* dlamch LAPACK routine that determines machine constants. */
/* dlapy2 LAPACK routine to compute sqrt(x**2+y**2) carefully. */
/* \Author */
/* Danny Sorensen Phuong Vu */
/* Richard Lehoucq CRPC / Rice University */
/* Dept. of Computational & Houston, Texas */
/* Applied Mathematics */
/* Rice University */
/* Houston, Texas */
/* \Revision history: */
/* xx/xx/92: Version ' 2.1' */
/* \SCCS Information: @(#) */
/* FILE: nconv.F SID: 2.3 DATE OF SID: 4/20/96 RELEASE: 2 */
/* \Remarks */
/* 1. xxxx */
/* \EndLib */
/* ----------------------------------------------------------------------- */
/* Subroutine */ int dnconv_(integer *n, doublereal *ritzr, doublereal *ritzi,
doublereal *bounds, doublereal *tol, integer *nconv)
{
/* System generated locals */
integer i__1;
doublereal d__1, d__2;
/* Builtin functions */
double pow_dd(doublereal *, doublereal *);
/* Local variables */
static integer i__;
static real t0, t1;
static doublereal eps23, temp;
extern doublereal dlapy2_(doublereal *, doublereal *), dlamch_(char *,
ftnlen);
extern /* Subroutine */ int second_(real *);
/* %----------------------------------------------------% */
/* | Include files for debugging and timing information | */
/* %----------------------------------------------------% */
/* \SCCS Information: @(#) */
/* FILE: debug.h SID: 2.3 DATE OF SID: 11/16/95 RELEASE: 2 */
/* %---------------------------------% */
/* | See debug.doc for documentation | */
/* %---------------------------------% */
/* %------------------% */
/* | Scalar Arguments | */
/* %------------------% */
/* %--------------------------------% */
/* | See stat.doc for documentation | */
/* %--------------------------------% */
/* \SCCS Information: @(#) */
/* FILE: stat.h SID: 2.2 DATE OF SID: 11/16/95 RELEASE: 2 */
/* %-----------------% */
/* | Array Arguments | */
/* %-----------------% */
/* %---------------% */
/* | Local Scalars | */
/* %---------------% */
/* %--------------------% */
/* | External Functions | */
/* %--------------------% */
/* %-----------------------% */
/* | Executable Statements | */
/* %-----------------------% */
/* %-------------------------------------------------------------% */
/* | Convergence test: unlike in the symmetric code, I am not | */
/* | using things like refined error bounds and gap condition | */
/* | because I don't know the exact equivalent concept. | */
/* | | */
/* | Instead the i-th Ritz value is considered "converged" when: | */
/* | | */
/* | bounds(i) .le. ( TOL * | ritz | ) | */
/* | | */
/* | for some appropriate choice of norm. | */
/* %-------------------------------------------------------------% */
/* Parameter adjustments */
--bounds;
--ritzi;
--ritzr;
/* Function Body */
second_(&t0);
/* %---------------------------------% */
/* | Get machine dependent constant. | */
/* %---------------------------------% */
eps23 = dlamch_("Epsilon-Machine", (ftnlen)15);
eps23 = pow_dd(&eps23, &c_b3);
*nconv = 0;
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
/* Computing MAX */
d__1 = eps23, d__2 = dlapy2_(&ritzr[i__], &ritzi[i__]);
temp = max(d__1,d__2);
if (bounds[i__] <= *tol * temp) {
++(*nconv);
}
/* L20: */
}
second_(&t1);
timing_1.tnconv += t1 - t0;
return 0;
/* %---------------% */
/* | End of dnconv | */
/* %---------------% */
} /* dnconv_ */
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