TABLE_IO
Table Files
Read and Write Utilities

TABLE_IO is a C++ library, using double precision arithmetic, which can read or write 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 TABLE_WRITE. A typical read operation will probably first want to call TABLE_HEADER_READ to determine the values of M and N, and then allocate space for the table, and then call TABLE_DATA_READ to read the data.

Related Data and Programs:

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

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

TABLE_DELAUNAY is an executable C++ program that reads a file of 2d point coordinates and computes the Delaunay triangulation.

TABLE_DISCREPANCY is a C++ program that bounds the star discrepancy of a point set.

TABLE_IO is also available in a C version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

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

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

TABLE_READ is a MATLAB script that can read in a TABLE file.

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

TABLE_VORONOI is a C++ program that 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.
• table_io.csh, commands to compile the source code.

Examples and Tests:

• table_io_prb.C, a sample calling program.
• table_io_prb.csh, commands to compile and run the sample program.
• table_io_prb_output.txt, the output from a run of the sample program.
• dtable_05_00020.txt, the double precision table file created by the sample program, with N = 20 points in M = 5 dimensions.
• itable_05_00020.txt, the integer 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 if two characters are equal, disregarding case.
• CH_TO_DIGIT returns the integer value of a base 10 digit.
• DTABLE_CLOSE_WRITE closes a file to which a DTABLE was to be written.
• DTABLE_DATA_BORDER_ADD adds a "border" to DTABLE data.
• DTABLE_DATA_BORDER_CUT cuts the "border" of DTABLE data.
• DTABLE_DATA_READ reads the data from a DTABLE file.
• DTABLE_DATA_WRITE writes data to a DTABLE file.
• DTABLE_HEADER_READ reads the header from a DTABLE file.
• DTABLE_HEADER_WRITE writes the header of a DTABLE file.
• DTABLE_READ reads information from a DTABLE file.
• DTABLE_WRITE writes information to a DTABLE file.
• 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 ABS(X).
• I4_MAX returns the maximum of two integers.
• I4_MIN returns the smaller of two integers.
• I4MAT_INDICATOR sets up an "indicator" I4MAT.
• I4MAT_PRINT prints an I4MAT, with an optional title.
• I4MAT_PRINT_SOME prints some of an I4MAT.
• ITABLE_DATA_BORDER_ADD adds a "border" to ITABLE data.
• ITABLE_DATA_BORDER_CUT cuts the "border" of an ITABLE data.
• ITABLE_DATA_READ reads data from an ITABLE file.
• ITABLE_DATA_WRITE writes data to an ITABLE file.
• ITABLE_HEADER_READ reads the header from an ITABLE file.
• ITABLE_HEADER_WRITE writes the header of an ITABLE file.
• ITABLE_READ reads the information from an ITABLE file.
• ITABLE_WRITE writes information to an ITABLE file.
• R8_EPSILON returns the R8 roundoff unit.
• R8MAT_INDICATOR sets up an "indicator" R8MAT.
• R8MAT_PRINT prints an R8MAT, with an optional title.
• R8MAT_PRINT_SOME prints some of an R8MAT.
• 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.
• S_LEN_TRIM returns the length of a string to the last nonblank.
• S_TO_I4 reads an integer value from a string.
• S_TO_I4VEC reads an integer vector from a string.
• S_TO_R8 reads an R8 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.
• TIMESTRING returns the current YMDHMS date as a string.

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