Package org.apache.spark.rdd

Class DoubleRDDFunctions

Object
org.apache.spark.rdd.DoubleRDDFunctions
All Implemented Interfaces:
Serializable, org.apache.spark.internal.Logging, scala.Serializable
public class DoubleRDDFunctions extends Object implements org.apache.spark.internal.Logging, scala.Serializable
Extra functions available on RDDs of Doubles through an implicit conversion.
See Also:

  • Nested Class Summary

    Nested classes/interfaces inherited from interface org.apache.spark.internal.Logging

    org.apache.spark.internal.Logging.SparkShellLoggingFilter

  • Constructor Summary

    Constructors
    Constructor
    Description
    DoubleRDDFunctions(RDD<Object> self)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    long[]
    histogram(double[] buckets, boolean evenBuckets)
    Compute a histogram using the provided buckets.
    scala.Tuple2<double[],long[]>
    histogram(int bucketCount)
    Compute a histogram of the data using bucketCount number of buckets evenly spaced between the minimum and maximum of the RDD.
    double
    mean()
    Compute the mean of this RDD's elements.
    PartialResult<BoundedDouble>
    meanApprox(long timeout, double confidence)
    Approximate operation to return the mean within a timeout.
    double
    popStdev()
    Compute the population standard deviation of this RDD's elements.
    double
    popVariance()
    Compute the population variance of this RDD's elements.
    double
    sampleStdev()
    Compute the sample standard deviation of this RDD's elements (which corrects for bias in estimating the standard deviation by dividing by N-1 instead of N).
    double
    sampleVariance()
    Compute the sample variance of this RDD's elements (which corrects for bias in estimating the variance by dividing by N-1 instead of N).
    StatCounter
    stats()
    Return a StatCounter object that captures the mean, variance and count of the RDD's elements in one operation.
    double
    stdev()
    Compute the population standard deviation of this RDD's elements.
    double
    sum()
    Add up the elements in this RDD.
    PartialResult<BoundedDouble>
    sumApprox(long timeout, double confidence)
    Approximate operation to return the sum within a timeout.
    double
    variance()
    Compute the population variance of this RDD's elements.

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    Methods inherited from interface org.apache.spark.internal.Logging

    initializeForcefully, initializeLogIfNecessary, initializeLogIfNecessary, initializeLogIfNecessary$default$2, isTraceEnabled, log, logDebug, logDebug, logError, logError, logInfo, logInfo, logName, logTrace, logTrace, logWarning, logWarning, org$apache$spark$internal$Logging$$log_, org$apache$spark$internal$Logging$$log__$eq

  • Constructor Details

    • DoubleRDDFunctions

      public DoubleRDDFunctions(RDD<Object> self)

  • Method Details

    • histogram

      public scala.Tuple2<double[],long[]> histogram(int bucketCount)
      Compute a histogram of the data using bucketCount number of buckets evenly spaced between the minimum and maximum of the RDD. For example if the min value is 0 and the max is 100 and there are two buckets the resulting buckets will be [0, 50) [50, 100]. bucketCount must be at least 1 If the RDD contains infinity, NaN throws an exception If the elements in RDD do not vary (max == min) always returns a single bucket.
      Parameters:
      bucketCount - (undocumented)
      Returns:
      (undocumented)

    • histogram

      public long[] histogram(double[] buckets, boolean evenBuckets)
      Compute a histogram using the provided buckets. The buckets are all open to the right except for the last which is closed. e.g. for the array [1, 10, 20, 50] the buckets are [1, 10) [10, 20) [20, 50] e.g <=x<10, 10<=x<20, 20<=x<=50 And on the input of 1 and 50 we would have a histogram of 1, 0, 1

      Parameters:
      buckets - (undocumented)
      evenBuckets - (undocumented)
      Returns:
      (undocumented)
      Note:
      If your histogram is evenly spaced (e.g. [0, 10, 20, 30]) this can be switched from an O(log n) insertion to O(1) per element. (where n = # buckets) if you set evenBuckets to true. buckets must be sorted and not contain any duplicates. buckets array must be at least two elements All NaN entries are treated the same. If you have a NaN bucket it must be the maximum value of the last position and all NaN entries will be counted in that bucket.

    • mean

      public double mean()
      Compute the mean of this RDD's elements.

    • meanApprox

      public PartialResult<BoundedDouble> meanApprox(long timeout, double confidence)
      Approximate operation to return the mean within a timeout.
      Parameters:
      timeout - (undocumented)
      confidence - (undocumented)
      Returns:
      (undocumented)

    • popStdev

      public double popStdev()
      Compute the population standard deviation of this RDD's elements.
      Returns:
      (undocumented)

    • popVariance

      public double popVariance()
      Compute the population variance of this RDD's elements.
      Returns:
      (undocumented)

    • sampleStdev

      public double sampleStdev()
      Compute the sample standard deviation of this RDD's elements (which corrects for bias in estimating the standard deviation by dividing by N-1 instead of N).
      Returns:
      (undocumented)

    • sampleVariance

      public double sampleVariance()
      Compute the sample variance of this RDD's elements (which corrects for bias in estimating the variance by dividing by N-1 instead of N).
      Returns:
      (undocumented)

    • stats

      public StatCounter stats()
      Return a StatCounter object that captures the mean, variance and count of the RDD's elements in one operation.
      Returns:
      (undocumented)

    • stdev

      public double stdev()
      Compute the population standard deviation of this RDD's elements.

    • sum

      public double sum()
      Add up the elements in this RDD.

    • sumApprox

      public PartialResult<BoundedDouble> sumApprox(long timeout, double confidence)
      Approximate operation to return the sum within a timeout.
      Parameters:
      timeout - (undocumented)
      confidence - (undocumented)
      Returns:
      (undocumented)

    • variance

      public double variance()
      Compute the population variance of this RDD's elements.