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139 lines
4.4 KiB
Fortran
139 lines
4.4 KiB
Fortran
!
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! READ_MAT subroutine reads a matrix and its right hand sides,
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! all stored in Matrix Market format file. The B field is optional,.
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!
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! Character :: filename*20
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! On Entry: name of file to be processed.
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! On Exit : unchanged.
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!
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! Type(D_SPMAT) :: A
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! On Entry: fresh variable.
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! On Exit : will contain the global sparse matrix as follows:
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! A%AS for coefficient values
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! A%IA1 for column indices
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! A%IA2 for row pointers
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! A%M for number of global matrix rows
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! A%K for number of global matrix columns
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!
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! Integer :: ICTXT
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! On Entry: BLACS context.
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! On Exit : unchanged.
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!
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! Real(Kind(1.D0)), Pointer, Optional :: B(:,:)
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! On Entry: fresh variable.
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! On Exit: will contain right hand side(s).
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!
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! Integer, Optional :: inroot
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! On Entry: Index of root processor (default: 0)
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! On Exit : unchanged.
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!
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! Real(Kind(1.D0)), Pointer, Optional :: indwork(:)
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! On Entry/Exit: Double Precision Work Area.
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!
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! Integer, Pointer, Optional :: iniwork()
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! On Entry/Exit: Integer Work Area.
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!
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module read_mat
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public readmat
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public read_rhs
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public zreadmat
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public zread_rhs
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contains
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subroutine readmat (filename, a, ictxt, inroot)
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use psb_spmat_type
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use mmio
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implicit none
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integer :: ictxt
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type(psb_dspmat_type) :: a
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character(len=*) :: filename
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integer, optional :: inroot
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integer, parameter :: infile = 2
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integer :: info, root, nprow, npcol, myprow, mypcol
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if (present(inroot)) then
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root = inroot
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else
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root = 0
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end if
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call blacs_gridinfo(ictxt, nprow, npcol, myprow, mypcol)
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if (myprow == root) then
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write(*, '("Reading matrix...")') ! open input file
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call mm_mat_read(a,info,infile,filename)
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if (info /= 0) then
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write(0,*) 'Error return from MM_MAT_READ ',info
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call blacs_abort(ictxt, 1) ! Unexpected End of File
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endif
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end if
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return
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end subroutine readmat
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subroutine read_rhs (filename, b, ictxt, inroot,&
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& indwork, iniwork)
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implicit none
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integer :: ictxt
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character :: filename*(*)
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integer, optional :: inroot
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real(kind(1.0d0)), pointer, optional :: indwork(:)
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integer, pointer, optional :: iniwork(:) ! local variables
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integer, parameter :: infile = 2
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integer :: nrow, ncol, i,root, nprow, npcol, myprow, mypcol, ircode, j
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character :: mmheader*15, fmt*15, object*10, type*10, sym*15,&
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& line*1024
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real(kind(1.0d0)), pointer :: b(:,:)
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if (present(inroot)) then
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root = inroot
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else
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root = 0
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end if
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call blacs_gridinfo(ictxt, nprow, npcol, myprow, mypcol)
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if (myprow == root) then
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write(*, '("Reading rhs...")') ! open input file
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open(infile,file=filename, status='old', err=901, action="read")
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read(infile,fmt=*, end=902) mmheader, object, fmt, type, sym
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write(0,*)'obj fmt',object, fmt
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if ( (object .ne. 'matrix').or.(fmt.ne.'array')) then
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write(0,*) 'read_rhs: input file type not yet supported'
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call blacs_abort(ictxt, 1)
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end if
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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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read(line,fmt=*)nrow,ncol
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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(b(nrow,ncol),stat = ircode)
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if (ircode /= 0) goto 993
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read(infile,fmt=*,end=902) ((b(i,j), i=1,nrow),j=1,ncol)
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else
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write(0,*) 'read_rhs: rhs type not yet supported'
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call blacs_abort(ictxt, 1)
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end if ! read right hand sides
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write(*,*) 'end read_rhs'
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end if
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return
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! open failed
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901 write(0,*) 'read_rhs: could not open file ',&
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& infile,' for input'
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call blacs_abort(ictxt, 1) ! unexpected end of file
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902 write(0,*) 'read_rhs: unexpected end of file ',infile,&
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& ' during input'
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call blacs_abort(ictxt, 1) ! allocation failed
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993 write(0,*) 'read_rhs: memory allocation failure'
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call blacs_abort(ictxt, 1)
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end subroutine read_rhs
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end module read_mat
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