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Posted to commits@mahout.apache.org by jm...@apache.org on 2010/01/28 08:51:31 UTC

svn commit: r903988 - /lucene/mahout/trunk/math/src/main/java/org/apache/mahout/math/AbstractVector.java

Author: jmannix
Date: Thu Jan 28 07:51:31 2010
New Revision: 903988

URL: http://svn.apache.org/viewvc?rev=903988&view=rev
Log:
Round-off errors... distances should be positive, but could be ever-so-slightly negative.

Modified:
    lucene/mahout/trunk/math/src/main/java/org/apache/mahout/math/AbstractVector.java

Modified: lucene/mahout/trunk/math/src/main/java/org/apache/mahout/math/AbstractVector.java
URL: http://svn.apache.org/viewvc/lucene/mahout/trunk/math/src/main/java/org/apache/mahout/math/AbstractVector.java?rev=903988&r1=903987&r2=903988&view=diff
==============================================================================
--- lucene/mahout/trunk/math/src/main/java/org/apache/mahout/math/AbstractVector.java (original)
+++ lucene/mahout/trunk/math/src/main/java/org/apache/mahout/math/AbstractVector.java Thu Jan 28 07:51:31 2010
@@ -242,7 +242,8 @@
     while(it.hasNext() && (e = it.next()) != null) {
       d += e.get() * (e.get() - 2 * randomlyAccessed.getQuick(e.index()));
     }
-    return d;
+    assert(d > -1e-9); // round-off errors should never be too far off!
+    return Math.abs(d);
   }
 
   @Override