TABLE_UNIFORM_NOISE
Add Uniform Random Noise to a Table Dataset

TABLE_UNIFORM_NOISE is a FORTRAN90 program which adjusts an M dimensional dataset of N points by adding scaled uniform "noise" to each entry.

TABLE_UNIFORM_NOISE expects the input data file to be in the simple TABLE format.

Usage:

table_uniform_noise file.txt

reads the user's data file file.txt, prompts for a scale vector and a random number seed from the user, and then writes the noisy data to a file which will be called file.uniform_noise.txt.

Licensing:

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

Languages:

TABLE_UNIFORM_NOISE is available in a FORTRAN90 version.

Related Data and Programs:

TABLE_BARPLOT_PPMA, a FORTRAN90 program which reads a table file and creates a PPMA bargraph of the data.

TABLE_BORDER, a FORTRAN90 program which can be used to add a border (of zero values) to a table file.

TABLE_COLUMNS, a FORTRAN90 program which can extract specific columns of data from a table file.

TABLE_COLUMNS_PERMUTE, a FORTRAN90 program which permutes the columns of a table file.

TABLE_DELAUNAY, a FORTRAN90 program which computes the Delaunay triangulation of a set of points.

TABLE_HISTOGRAM, a FORTRAN90 program which can make a histogram of a set of points stored in a table file.

TABLE_IO, a FORTRAN90 library which supplies the routines used to read the TABLE file.

TABLE_LATINIZE, a FORTRAN90 program which reads a file of points and creates a "latinized" version by adjusting the data.

TABLE_MERGE, a FORTRAN90 program which reads a file of points, and removes duplicates, and points that are close to each other.

TABLE_ORTHONORMALIZE, a FORTRAN90 program which reads a file of points and orthonormalizes the columns.

TABLE_QUALITY, a FORTRAN90 program which reads a file of points and computes the quality of dispersion.

TABLE_RECORD_MATCH, a FORTRAN90 program which can be used to find close records in a table file.

TABLE_SCALE, a FORTRAN90 program which can be used to multiply the entries of a table file by a scale vector.

TABLE_SHIFT, a FORTRAN90 program which can be used to shift the entries of a table file by a shift vector.

TABLE_STATS, a FORTRAN90 program which can read a table file and compute certain statistics.

TABLE_TET_MESH, a FORTRAN90 program which can read a table file of 3D data, and compute a tetrahedral mesh.

TABLE_TOP, a FORTRAN90 program which can read a table file of M-dimensional data and make a table of plots of all pairs of coordinates.

TABLE_UNBORDER, a FORTRAN90 program which can be used to remove the border from a table file.

TABLE_VORONOI, a FORTRAN90 program which can be used to compute information about the Voronoi diagram of the points.

Source Code:

• table_uniform_noise.f90, the source code.
• table_uniform_noise.sh, commands to compile, link and load the source code.

Examples and Tests:

GRID121 consists of 121 points on an 11 by 11 grid in the unit square. Files you may copy include:

• grid121.txt, 121 grid points in 2D.
• grid121.png, a PNG image of the points.
• grid121.uniform_noise1.txt, the points, with S = (0.3,0.1), SEED = 123456789.
• grid121.uniform_noise1.png, a PNG image of the points.
• grid121.uniform_noise2.txt, the points, with S = (0.0,0.5), SEED = 123456789.
• grid121.uniform_noise2.png, a PNG image of the points.
• grid121.uniform_noise3.txt, the points, with S = (0.03,0.01), SEED = 123456789.
• grid121.uniform_noise3.png, a PNG image of the points.

List of Routines:

• MAIN is the main program for TABLE_UNIFORM_NOISE.
• CH_CAP capitalizes a single character.
• CH_EQI is a case insensitive comparison of two characters for equality.
• 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_NAME_EXT_GET determines the "extension" of a file name.
• FILE_NAME_EXT_SWAP replaces the current "extension" of a file name.
• FILE_ROW_COUNT counts the number of row records in a file.
• GET_UNIT returns a free FORTRAN unit number.
• I4VEC_SORT_HEAP_INDEX_A does an indexed heap ascending sort of an integer vector.
• R8_UNIFORM_01 returns a unit pseudorandom R8.
• R8MAT_DATA_READ reads data from an R8MAT file.
• R8MAT_HEADER_READ reads the header from an R8MAT file.
• R8MAT_PRINT_SOME prints some of an R8MAT.
• R8MAT_WRITE writes an R8MAT file.
• S_BLANK_DELETE removes blanks from a string, left justifying the remainder.
• S_INDEX_LAST finds the LAST occurrence of a given substring.
• 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.

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