Object

com.twitter.algebird

MomentsGroup

Related Doc: package algebird

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object MomentsGroup extends Group[Moments]

A monoid to perform moment calculations.

Source
MomentsGroup.scala
Linear Supertypes
Group[Moments], Monoid[Moments], Semigroup[Moments], Serializable, AnyRef, Any
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Inherited
  1. MomentsGroup
  2. Group
  3. Monoid
  4. Semigroup
  5. Serializable
  6. AnyRef
  7. Any
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Visibility
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Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  5. def assertNotZero(v: Moments): Unit

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    Definition Classes
    Monoid
  6. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  7. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  8. def equals(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  9. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any
  11. def getCombinedMean(n: Long, an: Double, k: Long, ak: Double): Double

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    Given two streams of doubles (n, an) and (k, ak) of form (count, mean), calculates the mean of the combined stream.

    Given two streams of doubles (n, an) and (k, ak) of form (count, mean), calculates the mean of the combined stream.

    Uses a more stable online algorithm which should be suitable for large numbers of records similar to: http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Parallel_algorithm

  12. def hashCode(): Int

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    Definition Classes
    AnyRef → Any
  13. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  14. def isNonZero(v: Moments): Boolean

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    Definition Classes
    Monoid
  15. def minus(l: Moments, r: Moments): Moments

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    Definition Classes
    Group
  16. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  17. def negate(a: Moments): Moments

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    Definition Classes
    MomentsGroupGroup
  18. def nonZeroOption(v: Moments): Option[Moments]

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    Definition Classes
    Monoid
  19. final def notify(): Unit

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    Definition Classes
    AnyRef
  20. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  21. def plus(a: Moments, b: Moments): Moments

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    Combines two T instances associatively.

    Combines two T instances associatively.

    returns

    result of combining l and r

    Definition Classes
    MomentsGroupSemigroup
  22. def sum(vs: TraversableOnce[Moments]): Moments

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    Definition Classes
    Monoid
  23. def sumOption(iter: TraversableOnce[Moments]): Option[Moments]

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    Returns an instance of T calculated by summing all instances in iter in one pass.

    Returns an instance of T calculated by summing all instances in iter in one pass. Returns None if iter is empty, else Some[T].

    iter

    instances of T to be combined

    returns

    None if iter is empty, else an option value containing the summed T

    Definition Classes
    Semigroup
    Note

    Override if there is a faster way to compute this sum than iter.reduceLeftOption using plus.

  24. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  25. def toString(): String

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    Definition Classes
    AnyRef → Any
  26. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  27. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  28. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  29. val zero: Moments

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    Returns the identity element of T for plus.

    Returns the identity element of T for plus.

    Definition Classes
    MomentsGroupMonoid

Inherited from Group[Moments]

Inherited from Monoid[Moments]

Inherited from Semigroup[Moments]

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped