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module mmio
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use psb_spmat_type
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public mm_mat_read, mm_mat_write
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interface mm_mat_read
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module procedure dmm_mat_read
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end interface
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interface mm_mat_write
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module procedure dmm_mat_write
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end interface
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private desym
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contains
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subroutine dmm_mat_read(a, iret, iunit, filename)
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use psb_spmat_type
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implicit none
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type(psb_dspmat_type), intent(out) :: a
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integer, intent(out) :: iret
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integer, optional, intent(in) :: iunit
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character(len=*), optional, intent(in) :: filename
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character :: mmheader*15, fmt*15, object*10, type*10, sym*15
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character(1024) :: line
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integer :: indcrd, ptrcrd, totcrd,&
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& valcrd, rhscrd, nrow, ncol, nnzero, neltvl, nrhs, nrhsix
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real(kind(1.0d0)), pointer :: as_loc(:), dwork(:)
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integer, pointer :: ia1_loc(:), ia2_loc(:), iwork(:), tmp(:), aux(:)
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integer :: ircode, i,iel,ptr,nzr,infile,&
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& j, liwork, ldwork, root, nprow, npcol, myprow, mypcol
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logical, parameter :: debug=.false.
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iret = 0
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if (present(filename)) then
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if (filename=='-') then
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infile=5
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else
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if (present(iunit)) then
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infile=iunit
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else
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infile=99
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endif
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open(infile,file=filename, status='OLD', err=901, action='READ')
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endif
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else
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if (present(iunit)) then
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infile=iunit
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else
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infile=5
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endif
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endif
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read(infile,fmt=*,end=902) mmheader, object, fmt, type, sym
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call lowerc(object,1,10)
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call lowerc(fmt,1,15)
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if ( (object .ne. 'matrix').or.(fmt.ne.'coordinate')) then
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write(0,*) 'READ_MATRIX: input file type not yet supported'
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iret=909
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return
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end if
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if (debug) write(*,*) mmheader,':', object, ':',fmt,':', type,':', sym
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do
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read(infile,fmt='(a)') line
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if (line(1:1) /= '%') exit
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end do
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if (debug) write(*,*) 'Line on input : "',line,'"'
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read(line,fmt=*) nrow,ncol,nnzero
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if (debug) write(*,*) 'Out: ',nrow,ncol,nnzero
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a%m = nrow
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a%k = ncol
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a%fida = 'CSR'
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a%descra='G'
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call lowerc(type,1,10)
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call lowerc(sym,1,15)
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if ((type == 'real').and.(sym == 'general')) then
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allocate(a%aspk(nnzero), a%ia1(nnzero), a%ia2(nrow+1),&
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& a%pl(nrow),a%pr(nrow), tmp(nnzero+1), aux(nnzero+2),stat = ircode)
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if (ircode /= 0) goto 993
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do i=1,nnzero
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read(infile,fmt=*,end=902) tmp(i),a%ia1(i),a%aspk(i)
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end do
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call mrgsrt(nnzero,tmp,aux,ircode)
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if (ircode.eq.0) call reordvn(nnzero,a%aspk,tmp,a%ia1,aux)
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! .... Order with key a%ia1 (COLUMN INDEX) ...
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i = 1
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j = i
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! .... order with key tmp (row index) ...
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do
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if (i > nnzero) exit
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do
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if (j > nnzero) exit
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if (tmp(j) /= tmp(i)) exit
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j = j+1
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! if (j.eq.(nnzero+1)) exit
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enddo
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iel = j - i
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call mrgsrt(iel,a%ia1(i),aux,ircode)
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if (ircode == 0) call reordvn(iel,a%aspk(i),tmp(i),&
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& a%ia1(i), aux)
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i = j
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enddo
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! convert to csr format
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iel = 1
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a%ia2(1) = 1
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do i = a%ia2(1), nrow
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do
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if (tmp(iel) /= i) exit
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iel = iel + 1
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if (iel > nnzero) exit
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enddo
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a%ia2(i+1) = iel
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enddo
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deallocate(aux,tmp)
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else if ((type == 'real').and.(sym == 'symmetric')) then
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! we are generally working with non-symmetric matrices, so
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! we de-symmetrize what we are about to read
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allocate(a%aspk(2*nnzero),a%ia1(2*nnzero),&
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& a%ia2(2*nnzero),as_loc(2*nnzero),&
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& ia1_loc(2*nnzero),ia2_loc(2*nnzero),&
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& a%pl(nrow),a%pr(nrow), stat = ircode)
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if (ircode /= 0) goto 993
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do i=1,nnzero
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read(infile,fmt=*,end=902) a%ia1(i),a%ia2(i),a%aspk(i)
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end do
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liwork = 2*nnzero+2
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allocate(iwork(liwork), stat = ircode)
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if (ircode /= 0) goto 993
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! After this call NNZERO contains the actual value for
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! desymetrized matrix
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call desym(nrow, a%aspk, a%ia2, a%ia1, as_loc, ia2_loc,&
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& ia1_loc, iwork, nnzero, nzr)
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call psb_spreall(a,nzr,ircode)
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if (ircode /= 0) goto 993
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allocate(tmp(nzr),stat=ircode)
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if (ircode /= 0) goto 993
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if (.false.) then
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a%aspk(1:nzr) = as_loc(1:nzr)
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a%ia1(1:nzr) = ia2_loc(1:nzr)
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tmp(1:nzr) = ia1_loc(1:nzr)
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else
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do i=1,nzr
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a%aspk(i) = as_loc(i)
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a%ia1(i) = ia2_loc(i)
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tmp(i) = ia1_loc(i)
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end do
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endif
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iel = 1
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a%ia2(1) = 1
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do i = 1, nrow
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do
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if (tmp(iel) /= i) exit
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iel = iel + 1
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if (iel > nzr) exit
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enddo
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a%ia2(i+1) = iel
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enddo
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deallocate(as_loc, ia1_loc, ia2_loc,tmp,iwork)
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else
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write(0,*) 'read_matrix: matrix type not yet supported'
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iret=904
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end if
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if (infile/=5) close(infile)
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return
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! open failed
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901 iret=901
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write(0,*) 'read_matrix: could not open file ',filename,' for input'
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return
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902 iret=902
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write(0,*) 'READ_MATRIX: Unexpected end of file '
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return
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993 iret=993
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write(0,*) 'READ_MATRIX: Memory allocation failure'
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return
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end subroutine dmm_mat_read
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subroutine dmm_mat_write(a,mtitle,iret,eiout,filename)
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use psb_spmat_type
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implicit none
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type(psb_dspmat_type), intent(in) :: a
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integer, intent(out) :: iret
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character(len=*), intent(in) :: mtitle
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integer, optional, intent(in) :: eiout
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character(len=*), optional, intent(in) :: filename
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integer :: iout
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iret = 0
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if (present(filename)) then
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if (filename=='-') then
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iout=6
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else
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if (present(eiout)) then
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iout = eiout
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else
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iout=99
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endif
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open(iout,file=filename, err=901, action='WRITE')
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endif
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else
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if (present(eiout)) then
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iout = eiout
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else
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iout=6
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endif
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endif
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call psb_dcsprt(iout,a)
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if (iout /= 6) close(iout)
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return
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901 continue
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iret=901
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write(0,*) 'Error while opening ',filename
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return
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end subroutine dmm_mat_write
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subroutine desym(nrow,a,ja,ia,as,jas,ias,aux,nnzero,nzr)
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implicit none
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! .. scalar arguments ..
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integer :: nrow,nnzero,value,index,ptr, nzr
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! .. array arguments ..
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real(kind(1.d0)) :: a(*),as(*)
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integer :: ia(*),ias(*),jas(*),ja(*),aux(*)
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! .. local scalars ..
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integer :: i,iaw1,iaw2,iawt,j,jpt,k,kpt,ldim,nzl,js,iret,nel,diagel
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! ..
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nel = 0
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diagel=0
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do i=1, nnzero
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as(i) = a(i)
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jas(i) = ja(i)
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ias(i) = ia(i)
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if(ja(i) < ia(i)) then !this control avoids malfunctions in the cases
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! where the matrix is declared symmetric but all its elements are
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! explicitly stored see young1c.mtx from "Matrix Market".
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! Nominally Matrix Market only stores lower triangle.
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nel = nel+1
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as(nnzero+nel) = a(i)
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jas(nnzero+nel) = ia(i)
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ias(nnzero+nel) = ja(i)
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end if
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end do
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if (nel == 0) then ! Something strange is going on
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write(0,*) 'Warning: DESYM did not copy anything in the upper triangle. '
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write(0,*) ' This feels wrong!!!!! '
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endif
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! .... order with key ias ...
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nzr = nnzero + nel
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call mrgsrt(nzr,ias,aux,iret)
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if (iret == 0) call reordvn(nzr,as,ias,jas,aux)
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! .... order with key jas ...
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i = 1
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j = i
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do
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if (i > nzr) exit
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do
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if (j > nzr) exit
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if (ias(j) /= ias(i)) exit
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j = j+1
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enddo
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nzl = j - i
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call mrgsrt(nzl,jas(i),aux,iret)
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if (iret.eq.0) call reordvn(nzl,as(i),ias(i),jas(i),aux)
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i = j
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enddo
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return
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end subroutine desym
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end module mmio
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