TABLE_IO
Table Files
Read and Write Utilities

TABLE_IO is a C library which reads or writes a TABLE file.

A TABLE file is a simple format for storing a double-indexed array of data. We regard this is a situation involving N points in M dimensions, with M relatively small (often just 2 or 3, but possibly 10 or 20) while N can be "enormous" (10, 100, 1,000 or 10,000).

To keep things simple, then, the data is written to an ASCII file, with optional comment lines (which must start with the '#' character) and blank lines (which are ignored). The point data is stored by writing the coordinates of each point on a separate line. No information about M or N is explicitly included in the file. It is up to the I/O program to determine this.

TABLE_IO supplies routines by which a TABLE file can easily be written or read. A typical write operation simply calls routine R8MAT_WRITE. A typical read operation will probably first want to call R8MAT_HEADER_READ to determine the values of M and N, and then allocate space for the table, and then call R8MAT_DATA_READ to read the data.

Licensing:

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

Languages:

TABLE_IO is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version and

Related Data and Programs:

TABLE, a file format which is used for the storage of table files.

TABLE_BORDER, a C++ program which can read a TABLE file and add zero entries corresponding to a single layer of boundary data.

TABLE_DELAUNAY, a C++ program which reads a file of 2d point coordinates and computes the Delaunay triangulation.

TABLE_LATINIZE, a C++ program which can read a TABLE file and write out a "latinized" version.

TABLE_QUALITY, a C++ program which can read a TABLE file and print out measures of the quality of dispersion of the points.

TABLE_UNBORDER, a C++ program which can be used to remove the border from a table file.

TABLE_VORONOI, a C++ program which can read a TABLE file describing a set of 2D points, and print out information describing the Voronoi diagram of those points.

Source Code:

• table_io.c, the source code.
• table_io.h, the include file.

Examples and Tests:

• table_io_test.c, a sample calling program.
• table_io_test.txt, the output file.
• r8mat_05_00020.txt, the table file created by the sample program, with N = 20 points in M = 5 dimensions.
• i4mat_05_00020.txt, the table file created by the sample program, with N = 20 points in M = 5 dimensions.

List of Routines:

• CH_CAP capitalizes a single character.
• CH_EQI is TRUE (1) if two characters are equal, disregarding case.
• CH_TO_DIGIT returns the integer value of a base 10 digit.
• FILE_COLUMN_COUNT counts the number of columns in the first line of a file.
• FILE_ROW_COUNT counts the number of row records in a file.
• I4_LOG_10 returns the integer part of the logarithm base 10 of an I4.
• I4_MAX returns the maximum of two I4's.
• I4_MIN returns the smaller of two I4's.
• I4_POWER returns the value of I^J.
• I4MAT_BORDER_ADD adds a "border" to an I4MAT.
• I4MAT_BORDER_CUT cuts the "border" of an I4MAT.
• I4MAT_DATA_READ reads the data from an I4MAT file.
• I4MAT_HEADER_READ reads the header from an I4MAT file.
• I4MAT_INDICATOR_NEW sets up an "indicator" I4MAT.
• I4MAT_PRINT prints an I4MAT, with an optional title.
• I4MAT_PRINT_SOME prints some of an I4MAT.
• I4MAT_READ reads information from an I4MAT file.
• I4MAT_WRITE writes an I4MAT file.
• I4VEC_DATA_READ reads the data from an I4VEC file.
• I4VEC_WRITE writes an I4VEC to a file.
• L4VEC_DATA_READ reads the data from an L4VEC file.
• L4VEC_HEADER_READ reads the header from an L4VEC file.
• L4VEC_WRITE writes an L4VEC to a file.
• R4MAT_DATA_READ reads the data from an R4MAT file.
• R4MAT_HEADER_READ reads the header from an R4MAT file.
• R4MAT_INDICATOR_NEW sets up an "indicator" R4MAT.
• R4MAT_PRINT prints an R4MAT, with an optional title.
• R4MAT_PRINT_SOME prints some of an R4MAT.
• R4MAT_READ reads information from an R4MAT file.
• R4MAT_TRANSPOSE_PRINT prints an R4MAT, transposed.
• R4MAT_TRANSPOSE_PRINT_SOME prints some of an R4MAT, transposed.
• R4MAT_UNIFORM_01 returns a unit pseudorandom R4MAT.
• R4MAT_WRITE writes an R4MAT file.
• R8MAT_BORDER_ADD adds a "border" to an R8MAT.
• R8MAT_BORDER_CUT cuts the "border" of an R8MAT.
• R8MAT_DATA_READ reads the data from an R8MAT file.
• R8MAT_HEADER_READ reads the header from an R8MAT file.
• R8MAT_INDICATOR_NEW sets up an "indicator" R8MAT.
• R8MAT_PRINT prints an R8MAT, with an optional title.
• R8MAT_PRINT_SOME prints some of an R8MAT.
• R8MAT_READ reads information from an R8MAT file.
• R8MAT_READ_BIN reads an R8MAT from a binary file.
• R8MAT_TRANSPOSE_PRINT prints an R8MAT, transposed.
• R8MAT_TRANSPOSE_PRINT_SOME prints some of an R8MAT, transposed.
• R8MAT_UNIFORM_01 returns a unit pseudorandom R8MAT.
• R8MAT_WRITE writes an R8MAT file.
• R8MAT_WRITE_BIN writes an R8MAT to a binary file.
• R8VEC_DATA_READ reads the data from an R8VEC file.
• R8VEC_DATA_READ_NEW reads the data from an R8VEC file.
• R8VEC_HEADER_READ reads the header from an R8VEC file.
• R8VEC_WRITE writes an R8VEC file.
• R8VEC2_WRITE writes an R8VEC2 file.
• R8VLA2_WRITE writes an R8VLA2 file.
• S_LEN_TRIM returns the length of a string to the last nonblank.
• S_TO_I4 reads an I4 from a string.
• S_TO_I4VEC reads an I4VEC from a string.
• S_TO_L4 reads an L4 from a string.
• S_TO_R4 reads an R4 value from a string.
• S_TO_R4VEC reads an R4VEC from a string.
• S_TO_R8 reads an R8 value from a string.
• S_TO_R8VEC reads an R8VEC from a string.
• S_WORD_COUNT counts the number of "words" in a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

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