FD1D
Two Files Describing a 1D Finite Difference Model

FD1D is a data directory which contains examples of 1D FD files, which define a finite difference model.

The FD format is a simple dataset of two files that can be used to describe a finite difference model.

The finite difference model is assumed to include just two kinds of information:

• Node coordinates in 1D;
• Node values (scalars, vectors, or any set of data);

FD File Characteristics:

• ASCII
• Each line is one "record"
• Each record is either a comment record or a data record;
• Comment records begin with the "#" character;
• A data record records node coordinates for one node, or the set of node data for one node;
• For a given file, each data record contains the same number of items, separated by blanks.

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:

FD_TO_TEC, a MATLAB program which converts FD (finite difference) models into TECPLOT ASCII files.

FD1D_DISPLAY, a MATLAB program which reads a pair of files defining a 1D finite difference model, and plots the data.

FD2D, a data directory which contains examples of 2D FD files, two text files that can be used to describe many finite difference models;

FD3D, a data directory which contains examples of 3D FD files, two text files that can be used to describe many finite difference models;

Sample Files:

ARCTAN contains sample data from the arctangent function at 29 non-uniformly spaced nodes.

• arctan_nodes.txt
• arctan_values.txt
• arctan.png, a PNG snapshot of the plot.

FD1D_BVP_TEST01 contains the computed and exact solutions for a boundary value problem.

• fd1d_bvp_test01_nodes.txt, the nodes for test 1.
• fd1d_bvp_test01_values.txt, the computed and exact values for test 1.
• fd1d_bvp_test01.png, a PNG image of a plot of the computed and exact values.

PAIR shows how a plot is made when there are two columns of data in the "values" file. The first column is a copy of the original ARCTAN data, and the second column is some perturbed values.

• pair_nodes.txt
• pair_values.txt
• pair.png, a PNG snapshot of the plot.

You can go up one level to the DATA directory.