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From "Marco Speranza (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SANDBOX-374) Kruskal's algorithm doesn't accept sparse graph
Date Mon, 30 Jan 2012 22:31:14 GMT

     [ https://issues.apache.org/jira/browse/SANDBOX-374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marco Speranza updated SANDBOX-374:
-----------------------------------

    Attachment: SANDBOX-374-Kruskal-NotConnectGraph_problem.patch

Hi here is a patch that resolve the problem and the relative test case.

ciao
                
> Kruskal's algorithm doesn't accept sparse graph
> -----------------------------------------------
>
>                 Key: SANDBOX-374
>                 URL: https://issues.apache.org/jira/browse/SANDBOX-374
>             Project: Commons Sandbox
>          Issue Type: Bug
>          Components: Graph
>            Reporter: Marco Speranza
>         Attachments: SANDBOX-374-Kruskal-NotConnectGraph_problem.patch
>
>
> Hi guys,
> I found a little problem into Kruskal's algorithm when the input graph is not connected
and/or  it's a graph without the edges.
> I created a test case that produces the follow error:
> {code}
> Running org.apache.commons.graph.spanning.KruskalTestCase
> Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.096 sec <<<
FAILURE!
> verifyNotConnectedMinimumSpanningTree(org.apache.commons.graph.spanning.KruskalTestCase)
 Time elapsed: 0.007 sec  <<< ERROR!
> java.util.NoSuchElementException
>         at java.util.AbstractQueue.remove(AbstractQueue.java:90)
>         at org.apache.commons.graph.spanning.DefaultSpanningTreeAlgorithmSelector.applyingKruskalAlgorithm(DefaultSpanningTreeAlgorithmSelector.java:87)
> {code}
> ciao
> Marco

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