Otis Gospodnetic writes:
No, it is not safe. You should close the IndexWriter, then delete the
document and close IndexReader, and then get a new IndexWriter and
continue writing.
IIRC lucene takes care that you do so.
Locking prevents you from having an open IndexWriter and
modify the
I was basically thinking of using lucene to generate document
vectors, and writing my custom similarity algorithms for measuring
distance.
I could then run this data through k-means or SOM algorithms for
calculating clusters
First of all, I think it would already be great if there was some
I need to retrieve the value with simple queries on the data like:
col1 like %ab,
What does the ampersand mean?
col2 like %aa%
Lucene doesn't handle queries where the start of the term is not known
very efficiently.
and col3 sounds like ;
No experience with this, but you could
My lucene indexes contain fields with values like this www.xxx.yyy.zzz
which are treated as HOST tokens.
My problem is the following : search results never contain documents with
such fields when doing a wildcard query or a fuzzy query. Only searches on
full field values work.
example queries:
On Wednesday, November 12, 2003, at 05:55 AM, Pascal Nadal wrote:
My lucene indexes contain fields with values like this www.xxx.yyy.zzz
which are treated as HOST tokens.
My problem is the following : search results never contain documents
with
such fields when doing a wildcard query or a fuzzy
Correct. write.lock is used for that.
Otis
--- Morus Walter [EMAIL PROTECTED] wrote:
Otis Gospodnetic writes:
No, it is not safe. You should close the IndexWriter, then delete
the
document and close IndexReader, and then get a new IndexWriter and
continue writing.
IIRC lucene
col2 like %aa%
Lucene doesn't handle queries where the start of the term is not known
very efficiently.
Is it really able to handle them at all? I thought *foo-type queries were
not supported.
That's because I build two indexes for the purpose of simultaneous left and
right truncation. One
Hello group,
can somebody give me an overview to Lucene? What high level components does
it include? Particularly I want to asnwer the following questions regarding
available functionalty:
1) Does Lucene provide a Vector Space IR Model (with TF/IDF and Cosine
Similarity)?
2) Does Lucene provide
Hi Ralf,
On Nov 12, 2003, at 14:06, [EMAIL PROTECTED] wrote:
Does anybody know good articles which demonstrate parts of that or
give a
good start into Lucene?
Otis Gospodnetic's articles are a good starting point:
Introduction to Text Indexing with Apache Jakarta Lucene
when I do a query.toString(my default field), it prints exactly my query.
example: title:FE.MENU* gives title:FE.MENU* FE.MENU* when I search in
the default field and the field 'title'.
the HostFilter I wrote (that tokenizes again HOST tokens) works wonderfully.
PS: thanks Erik
Hello.
I've made a Filter which recognizes special words and return them in a
boosted form, in a QueryParser sense.
For instance, when the filter receives special_word, it returns
special_word^3, so as to boost it.
The problem is that the QueryParser understands the boost syntax when the
string
On Wednesday, November 12, 2003, at 10:43 AM, Pascal Nadal wrote:
the HostFilter I wrote (that tokenizes again HOST tokens) works
wonderfully.
I wonder if this has been fixed since Lucene 1.2 could you try the
latest 1.3RC build available and see if it works without your
HostFilter?
Erik
On Wednesday, November 12, 2003, at 10:53 AM, MOYSE Gilles (Cetelem)
wrote:
Hello.
I've made a Filter which recognizes special words and return them in a
boosted form, in a QueryParser sense.
For instance, when the filter receives special_word, it returns
special_word^3, so as to boost it.
The
Hello
well, not work zip the files.
I can send files, if somebody won, to personal email.
And if somebody can post this in a web site, very cool.
I don´t post in a web site.
Ernesto.
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Hi! Does anyone have the code of a Connection Pooling? I am using JDK 1.3.1.
Thank you!
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Hi,
does Lucene implement a Vector Space Model? If yes, does anybody have an
example of how using it?
Cheers,
Ralf
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Does Lucene implement Latent Semantic Indexing? Examples?
Ralf
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Which begs the question: why do you need to use an IndexReader rather
than an IndexWriter to delete an item?
On Tue, Nov 11, 2003 at 02:46:37PM -0800, Otis Gospodnetic wrote:
1). If I delete a term using an IndexReader, can I use an existing
IndexWriter to write to the index? Or do I need
I know this is rare, But I am building an application
that submits searches having 500+ search terms. A
general example would be
field1:w1 OR field1:w2 OR ... OR field1:w500
For 1 millions documents, the performance is OK if
field1 in each document has less than 50 terms, I can
get result 1
Hello,
This has probably been put forth on the list before, but how about the following
approach for leftmost wildcard searches, at least for single term searches?
Reverse the character order of all words after they're stemmed and before they're
added to a special reverse-character-order index.
I agree it's a bit of a strange design.
It seems that there should be one class that handles all modifications
of the index. Usually you'd only have one instance of this so you
wouldn't need to open and close it all the time (I'm basically writing
one of these classes myself to simplify my code.
I thought Erik's article was great. There was one
unanswered brainbender I had which I was hoping was in
there, but... Maybe you can add this topic to the next
one, Erik?
Here is my issue:
When using the QueryParser class, the parse method
will throw a TokenMgrError when there is a syntax
On Wednesday, November 12, 2003, at 11:52 PM, Tomcat Programmer wrote:
I thought Erik's article was great. There was one
unanswered brainbender I had which I was hoping was in
there, but... Maybe you can add this topic to the next
one, Erik?
Well, I'm not sure another article on QueryParser is
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