*
* $Id: eisrs3.F,v 1.1.1.1 1996/04/01 15:02:39 mclareni Exp $
*
* $Log: eisrs3.F,v $
* Revision 1.1.1.1  1996/04/01 15:02:39  mclareni
* Mathlib gen
*
*
#include "gen/pilot.h"
      SUBROUTINE EISRS3(NM,N,AR,RLB,RUB,MM,M,WR,ZR,IERR,WORK)
C     SOME EIGENVALUES AND CORRESPONDING EIGENVECTORS OF A REAL
C     SYMMETRIC MATRIX
C
      DIMENSION AR(NM,NM),WR(N),ZR(NM,NM),WORK(1)
      CALL TRED1(NM,N,AR,WORK,WORK(N+1),WORK(2*N+1))
      EPS1=0.0
      CALL BISECT(N,EPS1,WORK,WORK(N+1),WORK(2*N+1),RLB,RUB,MM,M,WR,
     X WORK(8*N+1),IERR,WORK(3*N+1),WORK(4*N+1))
      IF(IERR.NE.0) RETURN
      IF(M.EQ.0) RETURN
      CALL TINVIT(NM,N,WORK,WORK(N+1),WORK(2*N+1),M,WR,WORK(8*N+1),ZR,
     X IERR,WORK(3*N+1),WORK(4*N+1),WORK(5*N+1),WORK(6*N+1),WORK(7*N+1))
      IF(IERR.NE.0) RETURN
      CALL TRBAK1(NM,N,AR,WORK(N+1),M,ZR)
      RETURN
      END