Return an RDD that is a sampled subset of the given RDD.

Description

The same as ‘sample()’ in Spark. (We rename it due to signature inconsistencies with the ‘sample()’ function in R's base package.)

Usage

sampleRDD(rdd, withReplacement, fraction, seed)

## S4 method for signature 'RDD,logical,numeric,integer'
sampleRDD(rdd, withReplacement,
  fraction, seed)

Arguments

Examples

## Not run: 
##D sc <- sparkR.init()
##D rdd <- parallelize(sc, 1:10) # ensure each num is in its own split
##D collect(sampleRDD(rdd, FALSE, 0.5, 1618L)) # ~5 distinct elements
##D collect(sampleRDD(rdd, TRUE, 0.5, 9L)) # ~5 elements possibly with duplicates
## End(Not run)