Choosing random element

2015-06-16 Thread Maximilian Alber 
Hi Flinksters,

again a similar problem. I would like to choose ONE random element out of a
data set, without shuffling the whole set. Again I would like to have the
element (mathematically) randomly chosen.

Thanks!
Cheers,
Max

Re: Choosing random element

2015-06-16 Thread Maximilian Alber 
Thanks!
Cheers,
Max

On Tue, Jun 16, 2015 at 11:01 AM, Till Rohrmann trohrm...@apache.org
wrote:

 This might help you [1].

 Cheers,
 Till

 [1]
 http://stackoverflow.com/questions/2514061/how-to-pick-random-small-data-samples-using-map-reduce


 On Tue, Jun 16, 2015 at 10:16 AM Maximilian Alber 
 alber.maximil...@gmail.com wrote:

 Hi Flinksters,

 again a similar problem. I would like to choose ONE random element out of
 a data set, without shuffling the whole set. Again I would like to have the
 element (mathematically) randomly chosen.

 Thanks!
 Cheers,
 Max

Re: Choosing random element

2015-06-16 Thread Till Rohrmann 
This might help you [1].

Cheers,
Till

[1]
http://stackoverflow.com/questions/2514061/how-to-pick-random-small-data-samples-using-map-reduce

On Tue, Jun 16, 2015 at 10:16 AM Maximilian Alber 
alber.maximil...@gmail.com wrote:

 Hi Flinksters,

 again a similar problem. I would like to choose ONE random element out of
 a data set, without shuffling the whole set. Again I would like to have the
 element (mathematically) randomly chosen.

 Thanks!
 Cheers,
 Max

Re: Choosing random element

2015-06-16 Thread Sachin Goel 
Hi
If you're looking for an implementation, I wrote this in context of a
Random k-means initialization. Take a look at the {{weightedFit}} function.
https://github.com/sachingoel0101/flink/blob/clustering_initializations/flink-staging/flink-ml/src/main/scala/org/apache/flink/ml/clustering/KMeansRandomInit.scala

Note that numCluster is the number of points you need in the sample.

Regards
Sachin Goel

On Tue, Jun 16, 2015 at 2:45 PM, Maximilian Alber 
alber.maximil...@gmail.com wrote:

 Thanks!
 Cheers,
 Max

 On Tue, Jun 16, 2015 at 11:01 AM, Till Rohrmann trohrm...@apache.org
 wrote:

 This might help you [1].

 Cheers,
 Till

 [1]
 http://stackoverflow.com/questions/2514061/how-to-pick-random-small-data-samples-using-map-reduce


 On Tue, Jun 16, 2015 at 10:16 AM Maximilian Alber 
 alber.maximil...@gmail.com wrote:

 Hi Flinksters,

 again a similar problem. I would like to choose ONE random element out
 of a data set, without shuffling the whole set. Again I would like to have
 the element (mathematically) randomly chosen.

 Thanks!
 Cheers,
 Max