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/* arpack/dsconv.f -- translated by f2c (version 20090411).
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
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "v3p_netlib.h"
/* Common Block Declarations */
/*Extern 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: dsconv */
/* \Description: */
/* Convergence testing for the symmetric Arnoldi eigenvalue routine. */
/* \Usage: */
/* call dsconv */
/* ( N, RITZ, BOUNDS, TOL, NCONV ) */
/* \Arguments */
/* N Integer. (INPUT) */
/* Number of Ritz values to check for convergence. */
/* RITZ Double precision array of length N. (INPUT) */
/* The Ritz values to be checked for convergence. */
/* BOUNDS Double precision array of length N. (INPUT) */
/* Ritz estimates associated with the Ritz values in RITZ. */
/* TOL Double precision scalar. (INPUT) */
/* Desired relative accuracy for a Ritz value to be considered */
/* "converged". */
/* NCONV Integer scalar. (OUTPUT) */
/* Number of "converged" Ritz values. */
/* \EndDoc */
/* ----------------------------------------------------------------------- */
/* \BeginLib */
/* \Routines called: */
/* second ARPACK utility routine for timing. */
/* dlamch LAPACK routine that determines machine constants. */
/* \Author */
/* Danny Sorensen Phuong Vu */
/* Richard Lehoucq CRPC / Rice University */
/* Dept. of Computational & Houston, Texas */
/* Applied Mathematics */
/* Rice University */
/* Houston, Texas */
/* \SCCS Information: @(#) */
/* FILE: sconv.F SID: 2.4 DATE OF SID: 4/19/96 RELEASE: 2 */
/* \Remarks */
/* 1. Starting with version 2.4, this routine no longer uses the */
/* Parlett strategy using the gap conditions. */
/* \EndLib */
/* ----------------------------------------------------------------------- */
/*< subroutine dsconv (n, ritz, bounds, tol, nconv) >*/
/* Subroutine */ int dsconv_(integer *n, doublereal *ritz, doublereal *bounds,
doublereal *tol, integer *nconv)
{
/* System generated locals */
integer i__1;
doublereal d__1, d__2, d__3;
/* Builtin functions */
double pow_dd(doublereal *, doublereal *);
/* Local variables */
integer i__;
/* static real t0, t1; */
doublereal eps23, temp;
extern doublereal dlamch_(char *, ftnlen);
extern /* Subroutine */ int second_(real *);
/* %----------------------------------------------------% */
/* | Include files for debugging and timing information | */
/* %----------------------------------------------------% */
/*< include 'debug.h' >*/
/*< include 'stat.h' >*/
/* \SCCS Information: @(#) */
/* FILE: debug.h SID: 2.3 DATE OF SID: 11/16/95 RELEASE: 2 */
/* %---------------------------------% */
/* | See debug.doc for documentation | */
/* %---------------------------------% */
/*< >*/
/*< integer n, nconv >*/
/* %------------------% */
/* | Scalar Arguments | */
/* %------------------% */
/* %--------------------------------% */
/* | See stat.doc for documentation | */
/* %--------------------------------% */
/* \SCCS Information: @(#) */
/* FILE: stat.h SID: 2.2 DATE OF SID: 11/16/95 RELEASE: 2 */
/*< save t0, t1, t2, t3, t4, t5 >*/
/*< integer nopx, nbx, nrorth, nitref, nrstrt >*/
/*< >*/
/*< >*/
/*< >*/
/* %-----------------% */
/* | Array Arguments | */
/* %-----------------% */
/*< >*/
/* %---------------% */
/* | Local Scalars | */
/* %---------------% */
/*< integer i >*/
/*< >*/
/* %-------------------% */
/* | External routines | */
/* %-------------------% */
/*< >*/
/*< external dlamch >*/
/* %---------------------% */
/* | Intrinsic Functions | */
/* %---------------------% */
/*< intrinsic abs >*/
/* %-----------------------% */
/* | Executable Statements | */
/* %-----------------------% */
/*< call second (t0) >*/
/* Parameter adjustments */
--bounds;
--ritz;
/* Function Body */
/* second_(&t0); */
/*< eps23 = dlamch('Epsilon-Machine') >*/
eps23 = dlamch_("Epsilon-Machine", (ftnlen)15);
/*< eps23 = eps23**(2.0D+0 / 3.0D+0) >*/
eps23 = pow_dd(&eps23, &c_b3);
/*< nconv = 0 >*/
*nconv = 0;
/*< do 10 i = 1, n >*/
i__1 = *n;
for (i__ = 1; i__ <= i__1; ++i__) {
/* %-----------------------------------------------------% */
/* | The i-th Ritz value is considered "converged" | */
/* | when: bounds(i) .le. TOL*max(eps23, abs(ritz(i))) | */
/* %-----------------------------------------------------% */
/*< temp = max( eps23, abs(ritz(i)) ) >*/
/* Computing MAX */
d__2 = eps23, d__3 = (d__1 = ritz[i__], abs(d__1));
temp = max(d__2,d__3);
/*< if ( bounds(i) .le. tol*temp ) then >*/
if (bounds[i__] <= *tol * temp) {
/*< nconv = nconv + 1 >*/
++(*nconv);
/*< end if >*/
}
/*< 10 continue >*/
/* L10: */
}
/*< call second (t1) >*/
/* second_(&t1); */
/*< tsconv = tsconv + (t1 - t0) >*/
/* timing_1.tsconv += t1 - t0; */
/*< return >*/
return 0;
/* %---------------% */
/* | End of dsconv | */
/* %---------------% */
/*< end >*/
} /* dsconv_ */
#ifdef __cplusplus
}
#endif
|
