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Mac Magazin/MacEasy 26
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Mac Magazin and MacEasy Magazine CD - Issue 26.iso
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Wissenschaft & Technik
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TimGA 1.1 ƒ
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More Documentation
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Writing graph files
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1996-08-17
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_______________________________________________________________
TimGA — A freeware Mac application
Version 1.1 (August 1996)
By Timo Eloranta
Copyright © 1995-96 Brown Eyes Software
All rights reserved.
Internet e-mail: timo.eloranta@ac.com
_______________________________________________________________
Writing graph files
This document explains how you can write new graph files for TimGA.
The files in the "Graphs" folder are actually ordinary TEXT files with
creator type set to 'TiGA' (without this creator type the files wouldn't
show up with the custom icon...). The easiest way of creating a new
graph file with the correct creator type is duplicating one of the original
graph files. (Duplication is done in the Finder by selecting the file to be
duplicated and then choosing the Duplicate command from the File menu.)
You can open your new graph file with any text editor (for example
Apple's SimpleText). Here's an example of how a simple graph (a path
with 5 nodes) might look like:
_________________
|V|: 5 // Number of nodes
|E|: 4 // Number of edges
1 2 // Edges are represented as pairs of node numbers...
2 3
3 4
4 5
---
This graph is a path.
_________________
This example file has actually much more stuff in it than necessary,
since TimGA ignores everything but the numbers !!!
Here are the things that really matter:
• The first number in the text should be the quantity of nodes
in the graph (5 in this example).
• The second number in the text should be the quantity of edges
in the graph (4 in this example).
• After giving the node and edge quantities, you should list the
edges as pairs of nodes. If your graph is complex, it might be
a good idea to draw it first on paper. The nodes should be
numbered from 1 to |V|, where |V| means the quantity of nodes.
The order in which the edges are listed doesn't matter...
and neither does the order in which the nodes are given in
the pairs (In other words, the edges are undirected).
Both of the following mean just the same as the one above:
5 4 5 4 4 3 3 2 2 1
or 5 4 2 1 4 5 4 3 2 3.
That's it. When you're finished save your document with the name
of your choice. You can now open the graph with TimGA.
If you have any problems, let me know. If your problems are not
related to TimGA, I'm probably as clueless as you are... <grin>