HB_TO_MSM
Harwell Boeing Sparse Matrix File
converted to
Matlab Sparse Matrix

HB_TO_MSM is a MATLAB program which accepts the name of a file containing a sparse matrix in the Harwell Boeing Sparse Matrix File Format, and which reads that data and returns it as a MATLAB sparse matrix.

Licensing:

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

Related Data and Programs:

HB, a dataset directory which contains a collection of sparse matrices in the HB format.

HB_IO, a MATLAB library which reads and writes Harwell-Boeing files, used by HB_TO_MSM.

HB_TO_MM, a MATLAB program which converts a sparse matrix from Harwell-Boeing to Matrix Market format.

HB_TO_ST, a MATLAB program which converts a sparse matrix from Harwell-Boeing to sparse triplet format.

MM_TO_MSM, a MATLAB program which reads a Matrix Market file defining a sparse matrix, and creates a corresponding MATLAB sparse matrix data structure.

MSM_TO_HB, a MATLAB program which converts a MATLAB sparse matrix into a Harwell-Boeing file.

ST_TO_MSM, a MATLAB program which reads an ST sparse triplet file and creates a corresponding MATLAB Sparse Matrix.

TEMPLATES, a MATLAB library which carries out simple versions of various iterative solvers.

Reference:

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

Source Code:

• ch_cap.m, returns the uppercase version of a character.
• ch_eqi.m, determines whether two characters are the same, ignoring case.
• ch_is_digit.m, determines whether a character is a digit.
• ch_is_format_code.m, determines whether a character is a one letter FORTRAN format code.
• ch_to_digit.m, converts a character to the digit it represents.
• hb_exact_read.m, reads the exact solution vectors of an HB file.
• hb_file_read.m, reads an HB file.
• hb_guess_read.m, reads the starting guess vectors of an HB file.
• hb_header_read.m, reads the header of an HB file.
• hb_rhs_read.m, reads the right hand sides of an HB file.
• hb_structure_read.m, reads the structure of an HB file.
• hb_to_msm.m, reads an HB file and creates a MATLAB Sparse Matrix.
• hb_values_read.m, reads the values of an HB file.
• s_len_trim.m, determines the length of a string to the last nonblank.
• s_to_format.m, extracts information from a string representing a FORTRAN format.
• s_to_i4.m, converts a string to an I4.
• s_to_r8.m, converts a string to an R8.
• timestamp.m, prints the current YMDHMS date as a timestamp.

Examples and Tests:

• hb_to_msm_test.m, runs all the tests.
• hb_to_msm_test_output.txt, output from all the tests.
• hb_to_msm_test01.m, tests MSM_TO_HB on a matrix stored in an HB file.
• rua_32.txt, the HB file read by the test.

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