thanks, I use the port PyLucene, and I wonder if there is some utils in Lucene that can convert floating point number to sortable string, somebody tell me there should be such utils, but I can't find it in Lucene document.
Appreciate your help! 2007/1/10, Yonik Seeley <[EMAIL PROTECTED]>:
On 1/9/07, David <[EMAIL PROTECTED]> wrote: > Hi all: > How can I index float type term in Lucene so that we can search in a > range? I learned that it is possible to convert float to sortable string, > but I don't know how to do it. It's easiest/fastest in binary. The IEEE floating point format if interpreted as a signed integer is already very close to sorting correctly. If you already know how to index an integer, then do this: get the float bits as an int, and if the high bit is set, flip all other bits. That's how Solr does it: http://svn.apache.org/viewvc/incubator/solr/trunk/src/java/org/apache/solr/util/NumberUtils.java?view=markup public static String float2sortableStr(float val) { int f = Float.floatToRawIntBits(val); if (f<0) f ^= 0x7fffffff; return int2sortableStr(f); } -Yonik http://incubator.apache.org/solr Solr, the open-source Lucene search server --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
-- David
