subtract

Class: matlab.compiler.mlspark.RDD
Namespace: matlab.compiler.mlspark

Return the values resulting from the set difference between two RDDs

Syntax

result = subtract(obj1,obj2,numPartitions)


Description

result = subtract(obj1,obj2,numPartitions) returns elements that are the set difference of obj1 and obj2. numPartitions specifies the number of partitions to create in the resulting RDD.

Input Arguments

obj1 — First input RDD

RDD object

An input RDD, specified as a RDD object.

obj2 — Second input RDD

RDD object

An input RDD, specified as a RDD object.

numPartitions — Number of partitions to create

scalar value

Number of partitions to create, specified as a scalar value.

Data Types: double

Output Arguments

result — RDD containing the set subtraction of the two input RDDs

RDD object

A pipelined RDD containing the set subtraction of the two input RDDs, returned as a RDD object.

Examples

Set Difference of Two RDDs

%% Connect to Spark
sparkProp = containers.Map({'spark.executor.cores'}, {'1'});
conf = matlab.compiler.mlspark.SparkConf('AppName','myApp', ...
                        'Master','local[1]','SparkProperties',sparkProp);
sc = matlab.compiler.mlspark.SparkContext(conf);

%% subtract
x = sc.parallelize({ 1,2,3 });
y = sc.parallelize({ 2,4,5 });
c = x.subtract(y,2).collect(); % {1,3}

Version History

Introduced in R2016b