java - problem with precision and recall measuring in lucene -

i need calculate precision , recall value in lucene , use source code that

public class precisionrecall {  public static void main(string[] args) throws throwable {  file topicsfile = new file("c:/users/raden/documents/lucene/lucenehibernate/lia/lia2e/src/lia/benchmark/topics.txt"); file qrelsfile = new file("c:/users/raden/documents/lucene/lucenehibernate/lia/lia2e/src/lia/benchmark/qrels.txt"); directory dir = fsdirectory.open(new file("c:/users/raden/documents/myindex")); searcher searcher = new indexsearcher(dir, true);  string docnamefield = "filename";   printwriter logger = new printwriter(system.out, true);   trectopicsreader qreader = new trectopicsreader();   //#1 qualityquery qqs[] = qreader.readqueries(            //#1     new bufferedreader(new filereader(topicsfile))); //#1  judge judge = new trecjudge(new bufferedreader(      //#2     new filereader(qrelsfile)));                     //#2  judge.validatedata(qqs, logger);                     //#3  qualityqueryparser qqparser = new simpleqqparser("title", "contents");  //#4  qualitybenchmark qrun = new qualitybenchmark(qqs, qqparser, searcher, docnamefield); submissionreport submitlog = null; qualitystats stats[] = qrun.execute(judge,           //#5         submitlog, logger);  qualitystats avg = qualitystats.average(stats);      //#6 avg.log("summary",2,logger, "  "); dir.close(); } } 

and here contents of topicsfile

 <top> <num> number: 0 <title> apache source <desc> description: <narr> narrative: </top> 

and contents of qrelsfile

# format: # #       qnum   0   doc-name     is-relevant # #  0    0   apache1.0.txt       1 0    0   apache1.1.txt       1 0    0   apache2.0.txt       1 

now problem occur when ran source code displayed value of precision , recall zero. here result when ran source code.

0  -  contents:apache contents:source  0 stats: search seconds:         0.047 docname seconds:        0.039 num points:            56.000 num points:        0.000 max points:        3.000 average precision:      0.000 mrr:                    0.000 recall:                 0.000 precision @ 1:         0.000 precision @ 2:         0.000 precision @ 3:         0.000 precision @ 4:         0.000 precision @ 5:         0.000 precision @ 6:         0.000 precision @ 7:         0.000 precision @ 8:         0.000 precision @ 9:         0.000 precision @ 10:        0.000 precision @ 11:        0.000 precision @ 12:        0.000 precision @ 13:        0.000 precision @ 14:        0.000 precision @ 15:        0.000 precision @ 16:        0.000 precision @ 17:        0.000 precision @ 18:        0.000 precision @ 19:        0.000 precision @ 20:        0.000    summary search seconds:         0.047 docname seconds:        0.039 num points:            56.000 num points:        0.000 max points:        3.000 average precision:      0.000 mrr:                    0.000 recall:                 0.000 precision @ 1:         0.000 precision @ 2:         0.000 precision @ 3:         0.000 precision @ 4:         0.000 precision @ 5:         0.000 precision @ 6:         0.000 precision @ 7:         0.000 precision @ 8:         0.000 precision @ 9:         0.000 precision @ 10:        0.000 precision @ 11:        0.000 precision @ 12:        0.000 precision @ 13:        0.000 precision @ 14:        0.000 precision @ 15:        0.000 precision @ 16:        0.000 precision @ 17:        0.000 precision @ 18:        0.000 precision @ 19:        0.000 precision @ 20:        0.000 

now can tell me had done wrong make precision , recall values zeros? , mean when precision , recall value zero? reason doing because need measure performance of search engine, , precision , recall 1 of way me achieve it.

thanks though

precision = 0 means none of results correct. see the wikipedia article, example.

i suggest trying individual query, , see results are. have issue tokenizer; maybe not casing things right etc.