I am sorry. I meant 'unit Gaussian vectors'. I am also a little bit fuzzy on the definition of 'unit Guassian' vector. does it mean that second norm's mean is 1 or any single element's mean is 1?
On Wed, Apr 6, 2011 at 1:33 PM, Dmitriy Lyubimov <[email protected]> wrote: > Actually I ended up not to use even that i have an implementation. I > am currently using just Random.nextGaussian since i needed to generate > single Gaussian vectors and I meant to ask if that's the best way to > do it. > > I had a version once that used conversion from uniformly generated > murmur hash to gaussian similarly to what you discussed but again, I > had doubts that's the way. What's the way? > > -D > > On Wed, Apr 6, 2011 at 1:02 AM, Ted Dunning <[email protected]> wrote: >> The random matrix that dmitriy has uses MurmurHash based on the two indices >> to create the random values. They aren't cached since they are generated >> fairly quickly. >> >> On Wed, Apr 6, 2011 at 12:36 AM, Sean Owen (JIRA) <[email protected]> wrote: >> >>> >>> [ >>> https://issues.apache.org/jira/browse/MAHOUT-550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016285#comment-13016285] >>> >>> Sean Owen commented on MAHOUT-550: >>> ---------------------------------- >>> >>> Well it turns out MersenneTwisterRNG won't take a new seed, but it just >>> means setSeed() in RandomWrapper needs to make a new RNG instead. I can add >>> that, it's a detail. >>> >>> > Add RandomVector and RandomMatrix >>> > --------------------------------- >>> > >>> > Key: MAHOUT-550 >>> > URL: https://issues.apache.org/jira/browse/MAHOUT-550 >>> > Project: Mahout >>> > Issue Type: New Feature >>> > Components: Math >>> > Reporter: Lance Norskog >>> > Assignee: Sean Owen >>> > Attachments: MAHOUT-550.patch, MAHOUT-550.patch, >>> RandomMatrix.patch >>> > >>> > >>> > Add Vector and Matrix implementations that generate a unique and >>> reproducible random number for each index. >>> >>> -- >>> This message is automatically generated by JIRA. >>> For more information on JIRA, see: http://www.atlassian.com/software/jira >>> >> >
