: I'm using solr 4.0 and I'm using an atomic update to increment a tdouble : 3 times with the same value (99.4). The third time it is incremented the : values comes out to 298.20000000000005. Has anyone seen this error or : how to fix it? Maybe I should use the regular double instead of a : tdouble?
this is the general nature of floating point math in most langauges -- including java... http://stackoverflow.com/questions/322749/retain-precision-with-doubles-in-java http://www.ibm.com/developerworks/java/library/j-math2/index.html : 1 x "weight_td":{"set":0.0} : 3 x "weight_td":{"inc":99.4} public final class Temp { public static double val = 0.0D; public static void main(String[] args) { for (int i = 0; i < 5; i++) { System.out.println(i + ") " + val); val += 99.4; } } } // OUTPUT... // 0) 0.0 // 1) 99.4 // 2) 198.8 // 3) 298.20000000000005 // 4) 397.6 -Hoss
