DSP_TO_ST
Convert Sparse Matrix File from DSP to ST Format

DSP_TO_ST is a FORTRAN77 program which converts a sparse matrix file from the DSP (one-based-index) format to Sparse Triplet (ST) (zero-based index) format.

Usage:

dsp_to_st file.dsp

reads the user's data file file.dsp, reads the data, and writes the converted data to file.st.

Licensing:

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

Languages:

DSP_TO_ST is available in a FORTRAN77 version and a FORTRAN90 version.

Related Data and Programs:

DSP, a data directory which contains files using the DSP sparse matrix format.

HB_TO_ST, a FORTRAN77 program which reads a sparse matrix in a Harwell-Boeing (HB) file and writes an equivalent Sparse Triplet (ST) file.

LINPLUS, a FORTRAN77 library which carries out simple manipulations of matrices in a variety of formats.

ST, a data directory which contains files using the St sparse matrix format.

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

ST_TO_DSP, a FORTRAN77 program which converts an Sparse Triplet (ST) sparse matrix file to DSP format.

Source Code:

• dsp_to_st.f, the source code.
• dsp_to_st.sh, commands to compile, link and load the source code.

Examples and Tests:

The KERSHAW matrix is a 4 by 4 matrix. Files you may copy include:

• kershaw.dsp, the Kershaw matrix, stored in a DSP format file.
• kershaw.st, the Kershaw matrix, stored in an ST format file created by the command

  dsp_to_st kershaw.dsp.

List of Routines:

• MAIN is the main program for DSP_TO_ST.
• CH_INDEX_LAST is the last occurrence of a character in a string.
• FILENAME_EXT_GET determines the "extension" of a file name.
• FILENAME_EXT_SWAP replaces the current "extension" of a file name.
• GET_UNIT returns a free FORTRAN unit number.
• TIMESTAMP prints out the current YMDHMS date as a timestamp.

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