DLAP_IO
DLAP Sparse Matrix Files
Read and Write Utilities

DLAP_IO is a FORTRAN90 library which reads and writes files in the DLAP sparse matrix format, used by DLAP, the Sparse Linear Algebra Package.

Licensing:

The computer code and data files made available on this web page are distributed under the GNU LGPL license.

Languages:

DLAP_IO is available in a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

CC_IO, a FORTRAN90 library which reads and writes sparse linear systems stored in the Compressed Column (CC) format.

DLAP, a FORTRAN90 library which solves sparse linear systems.

HB_IO, a FORTRAN90 library which reads and writes sparse linear systems stored in the Harwell-Boeing Sparse Matrix format.

HB_TO_ST, a FORTRAN90 program which converts the sparse matrix information stored in a Harwell-Boeing file into a sparse triplet file.

MM_IO, a FORTRAN90 library which reads and writes sparse linear systems stored in the Matrix Market format.

ST_IO, a FORTRAN77 library which reads and writes sparse linear systems stored in the Sparse Triplet (ST) format.

Reference:

1. Iain Duff, Roger Grimes, John Lewis,
   User's Guide for the Harwell-Boeing Sparse Matrix Collection,
   October 1992.

Source Code:

• dlap_io.f90, the source code.

Examples and Tests:

• dlapb_io_test.f90, a sample calling program.
• dlap_io_test.txt, the output file.
• a5by5.dlap, a 5 by 5 matrix, right hand side, and solution, created by one routine in the calling program and read by another.
• a5by5_sym.dlap, a 5 by 5 symmetric matrix, right hand side, and solution, created by one routine in the calling program and read by another.

List of Routines:

• DLAP_FILE_PRINT prints a DLAP linear system that was stored in a file.
• DLAP_FILE_READ reads in a DLAP matrix contained in a file.
• DLAP_FILE_WRITE writes out DLAP Triad Format Linear System.
• DLAP_HEADER_PRINT prints the header line of a DLAP file.
• DLAP_HEADER_READ reads the header line from a DLAP file.
• DLAP_HEADER_WRITE writes the header line to a DLAP file.
• DLAP_RHS_PRINT prints the right hand side vector from a DLAP file.
• DLAP_RHS_READ reads the right hand side vector from a DLAP file.
• DLAP_RHS_WRITE writes a right hand side vector to a DLAP file.
• DLAP_SOLN_PRINT prints the solution vector from a DLAP file.
• DLAP_SOLN_READ reads the solution vector from a DLAP file.
• DLAP_SOLN_WRITE writes a solution vector to a DLAP file.
• DS3_PRINT prints a DS3 matrix.
• DS3_PRINT_SOME prints some of a DS3 matrix.
• GET_UNIT returns a free FORTRAN unit number.
• R8VEC_PRINT prints an R8VEC.
• R8VEC_PRINT_SOME prints "some" of an R8VEC.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the FORTRAN77 source codes.