C   Copyright (C) 2005 The Scalable Software Infrastructure Project. 
C   All rights reserved.
C
C   Redistribution and use in source and binary forms, with or without
C   modification, are permitted provided that the following conditions
C   are met:
C   1. Redistributions of source code must retain the above copyright
C      notice, this list of conditions and the following disclaimer.
C   2. Redistributions in binary form must reproduce the above
C      copyright notice, this list of conditions and the following
C      disclaimer in the documentation and/or other materials provided
C      with the distribution.
C   3. Neither the name of the project nor the names of its
C      contributors may be used to endorse or promote products derived
C      from this software without specific prior written permission.
C
C   THIS SOFTWARE IS PROVIDED BY THE SCALABLE SOFTWARE INFRASTRUCTURE
C   PROJECT ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
C   BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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C   THE SCALABLE SOFTWARE INFRASTRUCTURE PROJECT BE LIABLE FOR ANY
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      implicit none
      
#include "lisf.h"
 
      LIS_INTEGER i,n,gn,ln,is,ie,iter,ierr
      LIS_MATRIX A
      LIS_VECTOR x
      LIS_REAL evalue0
      LIS_ESOLVER esolver
      LIS_INTEGER my_rank,nprocs
      LIS_INTEGER matrix_type,comm_world
      LIS_INTEGER nsol,iter_double,iter_quad
      real*8 time,itime,ptime,p_c_time,p_i_time
      LIS_REAL resid
      character*30 nchar,esolvername
      integer*4 iargc
      
      call lis_initialize(ierr) 

#ifdef USE_MPI
      call MPI_Comm_size(MPI_COMM_WORLD,nprocs,ierr)
      call MPI_Comm_rank(MPI_COMM_WORLD,my_rank,ierr)
#else
      nprocs  = 1
      my_rank = 0
#endif

      matrix_type = LIS_MATRIX_CSR
      comm_world = LIS_COMM_WORLD

      call lis_matrix_create(comm_world,A,ierr)
      i = iargc()

      if( i.lt.1 ) then
        if( my_rank.eq.0 ) then
          write(*,*) 'etest4f n [options]'
          call lis_finalize(ierr)
        endif
        stop
      endif

      call getarg(1,nchar)
      read (nchar,*) n

      ln = 0

      call lis_matrix_create(comm_world,A,ierr)
      call lis_matrix_set_size(A,ln,n,ierr)
      call lis_matrix_get_size(A,n,gn,ierr)
      call lis_matrix_get_range(A,is,ie,ierr)
      do i=is,ie-1
        if( i>1  ) call lis_matrix_set_value(LIS_INS_VALUE,i,i-1,-1.0d0,
     .                                        A,ierr)
        if( i<gn ) call lis_matrix_set_value(LIS_INS_VALUE,i,i+1,-1.0d0,
     .                                        A,ierr)
        call lis_matrix_set_value(LIS_INS_VALUE,i,i,2.0d0,A,ierr)
      enddo
      call lis_matrix_set_type(A,matrix_type,ierr)
      call lis_matrix_assemble(A,ierr)
      
      call lis_vector_duplicate(A,x,ierr)
      call lis_vector_set_all(1.0d0,x,ierr)
      
      call lis_esolver_create(esolver,ierr)
      call lis_esolver_set_option('-eprint mem',esolver,ierr)
      call lis_esolver_set_optionC(esolver,ierr)
      call lis_esolve(A,x,evalue0,esolver,ierr)
      call CHKERR(ierr)
      call lis_esolver_get_iterex(esolver,iter,iter_double,iter_quad,
     .     ierr)
      call lis_esolver_get_timeex(esolver,time,itime,ptime,
     .     p_c_time,p_i_time,ierr)
      call lis_esolver_get_residualnorm(esolver,resid,ierr)
      call lis_esolver_get_esolver(esolver,nsol,ierr)
      call lis_esolver_get_esolvername(nsol,esolvername,ierr)

      If( my_rank.eq.0 ) then
        write(*,*) esolvername,': mode number          = ',0
        write(*,*) esolvername,': eigenvalue           = ',evalue0
        write(*,*) esolvername,': number of iterations = ',iter
        write(*,*) esolvername,': elapsed time         = ',time
        write(*,*) esolvername,':   preconditioner     = ',ptime
        write(*,*) esolvername,':     matrix creation  = ',p_c_time
        write(*,*) esolvername,': linear solver        = ',itime
        write(*,*) esolvername,': residual             = ',resid
        write(*,*) 
      endif

      call lis_matrix_destroy(A,ierr)
      call lis_vector_destroy(x,ierr)
      call lis_esolver_destroy(esolver,ierr)
      call lis_finalize(ierr)

      stop
      end
      
