CONTOUR
Preprocess data for contour plots

CONTOUR is a FORTRAN90 program which preprocesses simple grid data into a form that the DISPLAY3 program can handle.

The idea is that there is a set of nodes arranged in a rectangular grid. There is a file containing the coordinates of the nodes, and the values of certain quantities at each node. Specifically, for each node, there is a line of the form:

        X  Y  V1  V2 ... VN
      

CONTOUR reads this data, tries to determine the shape NX by NY of the grid, arranges the data into elements, and writes out an element file and a node file suitable for input to DISPLAY.

Usage:

The name of the input file is usually specified on the command line:

        contour input_file
      

Source Code:

• contour.f90, the source code;
• contour.csh, commands to compile and load the source code;

Examples and Tests:

• values.txt, the input file;
• node.txt, the output node file.
• element.txt, the output element file.

List of Routines:

The list of routines includes:

• CONTOUR organizes data on a rectangular grid into finite element data.
• FILE_COLUMN_COUNT counts the number of columns in the first line of a file.
• FILE_LINE_COUNT counts the number of lines in a file.
• GET_UNIT returns a free FORTRAN unit number.
• GRID_Q4 produces a grid of 4 node quadrilaterals.
• GRID_SHAPE_2D guesses the shape N1 by N2 of a vector of data.
• GRID_T3 produces a grid of pairs of 3 node triangles.
• GRID_T6 produces a grid of pairs of 6 node triangles.
• PERM_CHECK checks that a vector represents a permutation.
• RVEC2_SORT_HEAP_INDEX_A does an indexed heap ascending sort of a set of (X,Y) data.
• RVEC2_UNIQUE_INDEX indexes unique elements in a sorted array of pairs of reals.
• RVEC_PERMUTE permutes a real vector in place.
• RVEC_READ reads a vector of real data from a file.
• RMAT_READ reads a matrix of real data from a file.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• WRITE_ELEMENT writes an element data file.
• WRITE_NODE writes a node data file.
• WORD_COUNT counts the number of "words" in a string.

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