ST_IO
Read and Write Sparse Triplet (ST) Matrix Files.

ST_IO is a FORTRAN90 library which reads and writes files in the Sparse Triplet (ST) format used for storing sparse matrices.

Licensing:

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

Languages:

ST_IO is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Data and Programs:

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

CC_TO_ST, a FORTRAN90 library which converts a sparse matrix from compressed column (CC) to sparse triple (ST) format.

HB_IO, a FORTRAN90 library which reads and writes sparse linear systems stored in the Harwell Boeing (HB) format for sparse matrices.

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

ST, the format which is used for the input to this program.

ST_TO_CC, a FORTRAN90 library which converts sparse matrix data from Sparse Triplet (ST) format to Compressed Column (CC) format.

ST_TO_HB, a FORTRAN90 program which converts a sparse matrix file from Sparse Triplet (ST) format to Harwell Boeing (HB) format;

Source Code:

• st_io.f90, the source code.

Examples and Tests:

• st_io_test.f90, a sample calling program.
• st_io_test.txt, the output file.
• a5by5_r8.st, an ST file storing a 5 by 5 matrix.
• kershaw_r8.st, an ST file storing a 4 by 4 matrix.

List of Routines:

• GET_UNIT returns a free FORTRAN unit number.
• I4VEC_DEC decrements an I4VEC.
• I4VEC_INC increments an I4VEC.
• I4VEC_MAX computes the maximum element of an I4VEC.
• I4VEC_MIN computes the minimum element of an I4VEC.
• SORT_HEAP_EXTERNAL externally sorts a list of items into ascending order.
• R8ST_DATA_READ reads the data of an R8ST file.
• R8ST_HEADER_PRINT prints the header of an R8ST file.
• R8ST_HEADER_READ reads the header of an R8ST file.
• R8ST_PRINT prints a sparse matrix in R8ST format.
• R8ST_PRINT_SOME prints some of a sparse matrix in R8ST format.
• R8ST_SORT_A sorts the entries of an R8ST matrix by column.
• R8ST_TRANSPOSE transposes an R8ST matrix.
• R8ST_WRITE writes an R8ST file.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the FORTRAN90 source codes.