In order to use this program you will need a UNIX-based
system, a gcc C compiler, and Maple IV. You will probably have to
recompile the C programs as described below.

(NOTE)
  This program uses a program called Qhull. All the original code has
  been included and can be obtained via anonymous ftp from geom.umn.edu.
  The only modifications have been in the output format (in io.c).
  These modifications were made to make the output suitable for input
  to a maple routine which generates a list of all the faces of
  the given polytope.



Once you have down loaded the zip file do the following: 

1. Unzip the down loaded file using gunzip.

2. Untar the resulting tar file by typing:

     tar -xvf <tar file to be extracted>

3. This will create a directory qhull/ which contains all the needed code.

4. To compile the Qhull routines change into the qhull directory
    modify "Makefile" so that it works for your system and then type "make"


5. You may also need to compile the program named read.c.
   To do this change into the FACET_CODE directory and type:
    % gcc read.c -o ch2

Now you are ready to use the program

6. Create a file (using your favorite editor) called input, containing the 
   following information:
   i.   first line contains the dimension of space.
   ii.  second line contains the number of points.
   iii. then put in the coordinates of each of the points separated
        by spaces with one point per line. 
        (NOTE: it is important that there are no extra lines in this file.)

example: what the input file for a cube in 3-space would look like:
3
8
0 0 0
1 0 0
0 1 0
1 1 0
0 0 1
1 0 1
0 1 1
1 1 1

7.  Now while you are in the FACET_CODE directory start Maple.
8.  Type the command:
    read facet;
9 . the output will be in a file named outfile
    (Note: if you already have a file called 'outfile' 
     it will be overwritten)