2010/11/30 Chris Hostetter
>
> : Subject: What is the difference between the "AND" and "+" operator?
>
> In this query, "y" is mandatory, but documents that also match "x" will
> score higher then documents that only match "y"...
>
>x +y
>
> In both of these queries, "x" and "y" are both
with a single '=' :)
--
Anshum Gupta
http://ai-cafe.blogspot.com
On Tue, Nov 30, 2010 at 3:03 PM, maven apache wrote:
> 2010/11/30 Chris Hostetter
>
> >
> > : Subject: What is the difference between the "AND" and "+" operator?
> >
> > In this query, "y" is mandatory, but documents that also ma
Hi: I have two documents:
title body
Lucene In ActionA high-performance, full-featured text search
engine library.
Lucene Practice Use lucene in your application
Now,I search "lucene performance" using
private String[] f = { "title", "body"};
private
Can you try to do:
QueryParser qp = new MultiFieldQueryParser(params);
qp.setDefaultOperator(Operator.AND);
qp.parse(query);
See if that helps -- the static parse method instantiates its own QP and
therefore you cannot tell it that the default OP is AND.
Shai
On Tue, Nov 30, 2010 at 1:42 PM, mav
Sounds like you need to call setDefaultOperator(AND_OPERATOR). See
the javadocs for MultiFieldQueryParser constructors. They give
examples.
Personally I tend to get confused with all the Should/Must/And/Or
combinations with searches on multiple terms across multiple fields
and wherever possible
2010/11/30 Shai Erera
> Can you try to do:
> QueryParser qp = new MultiFieldQueryParser(params);
> qp.setDefaultOperator(Operator.AND);
> qp.parse(query);
>
> See if that helps -- the static parse method instantiates its own QP and
> therefore you cannot tell it that the default OP is AND.
>
> Th
You could change Occur.SHOULD to Occur.MUST for both fields.
This should work for you if what I understood is what you wanted.
--
Anshum Gupta
http://ai-cafe.blogspot.com
On Tue, Nov 30, 2010 at 5:12 PM, maven apache wrote:
> Hi: I have two documents:
>
> title body
> Luc
2010/11/30 Ian Lea
> Sounds like you need to call setDefaultOperator(AND_OPERATOR). See
> the javadocs for MultiFieldQueryParser constructors. They give
> examples.
>
> Personally I tend to get confused with all the Should/Must/And/Or
> combinations with searches on multiple terms across multip
On Mon, Nov 29, 2010 at 8:01 AM, Yakob wrote:
> hello all
> I was wondering, if I want to measure precision and recall in lucene
> then what's the best way for me to do it? is there any sample cource
> code that I can use?
>
Have a look at contrib/benchmark under the
org.apache.lucene.benchmark.q
WhitespaceAnalyzer does just that, splits the incoming stream on
white space.
>From the javadocs for StandardAnalyzer:
A grammar-based tokenizer constructed with JFlex
This should be a good tokenizer for most European-language documents:
- Splits words at punctuation characters, removing pun
Hi:
Sorry for later reply,I was just doing some tests.
Using the QueryParser.setDefaultOperator(..) do work ,but I found it just
for English character searching:
I have make a test,and compare three manner:
1)MultiFieldQueryParser.parse.
2)Set the Operator of MultiFieldQueryParser..
3)Using a
Hello,
I'm trying to retrieve payloads from the highlighteds terms by Highlighter
class. In my tests, all terms returned from Highlighter has null as payload.
Example:
Highlighter h = new Highlighter(new Formatter() {
public String highlightTerm(String originalText, TokenGroup tokenGroup) {
Token
On 11/30/10, Robert Muir wrote:
>
> Have a look at contrib/benchmark under the
> org.apache.lucene.benchmark.quality package.
> There is code (for example
> org.apache.lucene.benchmark.quality.trec.QueryDriver) that can run an
> experiment and output what you need for trec_eval.exe
> I think ther
On Tue, Nov 30, 2010 at 10:46 AM, Yakob wrote:
> can you tell me what went wrong? what is the difference between
> topicsFile and qrelsFile anyway?
>
well its hard to tell what you are supplying as topics and qrels.
have a look at /src/lia/benchmark in the LIA2 sample code: it has an
example top
I've figured out the PayloadSpanUtil class. It's exactly what I'm expecting.
But, I'm concerned about the warning message in API docs (indeed, I think I
dont understand it). There is any other approach? Can I have the same
results retrieving the termPositions without performance issues?
Thanks.
O
That's the Lucene developers' way of saying "we don't guarantee backwards
compatibility".
The devs go to great lengths to honor the contract of not changing public
APIs without
going through a deprecation process, which causes quite a lot of work. But
that conflicts
with the desirable process of h
Hello list,
I am currently attempting to extract keywords from pdf documents, my aim is
then to begin constructing a domain ontology using the words which are
extracted. I do not need to index anything at this stage, but wish to extract
and push the output as plain text into a text file. An exa
If I've understood you correctly, you want to pump text into a lucene
Analyzer and grab the output and do something else with that. If that
is right, you can use code based on something like this:
for (String s : array-of-input-texts) {
Analyzer anl = new xxxAnalyzer(whatever)
Ok. I'll go ahead.
Just one more thing: the apidocs warning says "(...) IndexReader should only
contain doc of interest, best to use MemoryIndex (..)".
How can I build a reader with a subset of docs?
Thanks!
On Tue, Nov 30, 2010 at 2:31 PM, Erick Erickson wrote:
> That's the Lucene developers' w
Hi,
Could someone tell me the effect (if any) of having term vectors set to
WITH_POSITIONS_OFFSETS vs YES in terms of search performance? I did some
testing and the results were inconclusive. In one case,
WITH_POSITIONS_OFFSETS was searched faster than YES, in all others, it was
the reverse. Is
The performance impact should only be at indexing time, unless you
actually retrieve the vectors for some number of hits at search time.
Mike
On Tue, Nov 30, 2010 at 2:28 PM, Maricris Villareal wrote:
> Hi,
>
> Could someone tell me the effect (if any) of having term vectors set to
> WITH_POSITI
Warning, ignorance alert. I'm not all that up on the guts of this one.
But take a look at MemoryIndex, there's an example there. The gist
is that you create a MemoryIndex on the fly and index the doc in question
into it, then you can get the IndexReader from the IndexSearcher associated
with the M
I am creating a program that can index many text files in different
folder. so that's mean every folder that has text files get indexed
and its index are stored in another folder. so this another folder
acts like a universal index of all files in my computer. and I am
using lucene to achieve this b
Greetings,
The Seattle Scalability Meetup isn't slacking for the holidays. We've
got an awesome lineup for Wed, December 8 at 7pm:
http://www.meetup.com/Seattle-Hadoop-HBase-NoSQL-Meetup/
-Jake Mannix from Twitter will talk about the Twitter Search
infrastructure (with distributed Lucene)
-Chris
Dear all.
Sorry if you found this question out off topic.
I need to do some research for my Text processing course on the on the
wikileaks iraq war log text documents but unable to get the data.
anybody who can give me a hint please
thank you.
Seid M.
25 matches
Mail list logo
