Hello. Le mer. 29 mai 2019 à 12:24, Marco Neumann <marco.neum...@gmail.com> a écrit : > > I am evaluating the use of Apache Math Commons Median for the querying of > large data sets in another Apache project called Apache Jena. > > In my preliminary performance tests I was surprised to find that a simple > implementation of a median function with Arrays.sort() and a programmatic > selection of the median value yields much faster results > than Median().evaluate() or DescriptiveStatistics.getPercentile(50).
:-( > Since we only use this function for Arrays of confirmed numbers What is a "confirmed number"? > is there a > particular benefit in using Apache Commons Math for this task or are we > better advised to use our own implementation here? There is ongoing work to refactor the "o.a.c.m.stat.descriptive" package of "Commons Math". The new code will be in "Commons Statistics".[1] Your observation is an interesting data point for this task; could you please file a report in JIRA[2] and/or mention on the "dev" ML? Thanks, Gilles [1] http://commons.apache.org/proper/commons-statistics/ [2] https://issues.apache.org/jira/projects/STATISTICS/issues/STATISTICS-15?filter=allopenissues > > Thank You --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
