josch/cycles_johnson_meyer
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read edges from stdin instead of argv

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josch 2013-04-11 10:18:03 +02:00
parent d30df0e98c
commit f45a13dde7
2 changed files with 22 additions and 12 deletions
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20
README.md
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@ -11,7 +11,7 @@ Usage
-----
make
java de.normalisiert.utils.graphs.TestCycles 4 0,1 0,2 1,0 1,3 2,0 3,0 3,1 3,2
echo "0 1\n0 2\n1 0\n1 3\n2 0\n3 0\n3 1\n3 2" | java de.normalisiert.utils.graphs.TestCycles 4
First argument is the number of vertices. Subsequent arguments are ordered
pairs of comma separated vertices that make up the directed edges of the
@ -24,12 +24,13 @@ For simplicity, there is no DOT file parser included but the following allows
to create a suitable argument string for simple DOT graphs.
Given a DOT file of a simple (no labels, colors, styles, only pairs of
vertices...) directed graph, the following line produces commandline
arguments in the above format for that graph.
vertices...) directed graph, the following lines generate the number of
vertices as well as the edge list expected on standard input.
echo `sed -n -e '/^\s*[0-9]\+;$/p' graph.dot | wc -l` `sed -n -e 's/^\s*\([0-9]\) -> \([0-9]\);$/\1,\2/p' graph.dot`
sed -n -e '/^\s*[0-9]\+;$/p' graph.dot | wc -l
sed -n -e 's/^\s*\([0-9]\) -> \([0-9]\);$/\1 \2/p' graph.dot
The above line works on DOT files like the following:
The above lines work on DOT files like the following:
digraph G {
0;
@ -42,6 +43,11 @@ The above line works on DOT files like the following:
2 -> 1;
}
It would produce the following output:
They would produce the following output:
3 0,1 0,2 1,0 2,0 2,1
3
0 1
0 2
1 0
2 0
2 1

14
de/normalisiert/utils/graphs/TestCycles.java
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@ -2,6 +2,7 @@ package de.normalisiert.utils.graphs;
import java.util.List;
import java.io.*;
/**
@ -15,9 +16,9 @@ public class TestCycles {
/**
* @param args
*/
public static void main(String[] args) {
if (args.length < 2) {
System.out.println("usage: de.normalisiert.utils.graphs.TestCycles num_vertices [v1,v2...]");
public static void main(String[] args) throws java.io.IOException {
if (args.length != 1) {
System.out.println("usage: echo \"v1 v2\nv1 v3\n...\" | de.normalisiert.utils.graphs.TestCycles num_vertices");
System.exit(1);
}
@ -43,8 +44,11 @@ public class TestCycles {
adjMatrix[7][9] = true;
adjMatrix[9][6] = true;*/
for (int i = 1; i < args.length; i++) {
String[] vertices = args[i].split(",", 2);
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
String line;
while ((line = stdin.readLine()) != null && line.length()!= 0) {
String[] vertices = line.split(" ", 2);
int v1 = Integer.parseInt(vertices[0]);
int v2 = Integer.parseInt(vertices[1]);
adjMatrix[v1][v2] = true;