Package de.tilman_neumann.jml.factor.tdiv

Class TDiv

java.lang.Object
de.tilman_neumann.jml.factor.FactorAlgorithm
de.tilman_neumann.jml.factor.tdiv.TDiv
public class TDiv
extends FactorAlgorithm
Trial division for large arguments.

  • Field Summary

    Fields inherited from class de.tilman_neumann.jml.factor.FactorAlgorithm

    NUM_PRIMES_FOR_31_BIT_TDIV, tdivLimit

  • Constructor Summary

    Constructors
    Constructor Description
    TDiv()  

  • Method Summary

    Modifier and Type Method Description
    void factor​(java.math.BigInteger N, SortedMultiset<java.math.BigInteger> primeFactors)
    Decomposes the argument N into prime factors.
    java.math.BigInteger findSingleFactor​(java.math.BigInteger N)
    Find a single factor of the given N, which is composite and odd.
    java.lang.String getName()  
    void searchFactors​(FactorArguments args, FactorResult result)
    Tries to find small factors of a positive, possibly large argument N by doing trial division by all primes p <= pLimit.
    TDiv setTestLimit​(int pLimit)
    Set the upper limit of primes to be tested.

    Methods inherited from class de.tilman_neumann.jml.factor.FactorAlgorithm

    factor, getDefault

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • TDiv

      public TDiv()

  • Method Details

    • getName

      public java.lang.String getName()
      Specified by:
      getName in class FactorAlgorithm
      Returns:
      The name of the algorithm, possibly including important parameters.

    • setTestLimit

      public TDiv setTestLimit​(int pLimit)
      Set the upper limit of primes to be tested.
      Parameters:
      pLimit - upper limit of primes to be tested
      Returns:
      this

    • factor

      public void factor​(java.math.BigInteger N, SortedMultiset<java.math.BigInteger> primeFactors)
      Description copied from class: FactorAlgorithm
      Decomposes the argument N into prime factors.
      Overrides:
      factor in class FactorAlgorithm
      Parameters:
      N - Number to factor.
      primeFactors - a map to which found factors are added

    • searchFactors

      public void searchFactors​(FactorArguments args, FactorResult result)
      Tries to find small factors of a positive, possibly large argument N by doing trial division by all primes p <= pLimit.
      Overrides:
      searchFactors in class FactorAlgorithm
      Parameters:
      args -
      result - a pre-initialized data structure to add results to

    • findSingleFactor

      public java.math.BigInteger findSingleFactor​(java.math.BigInteger N)
      Find a single factor of the given N, which is composite and odd. Very simple implementation just to complete the FactorAlgorithm interface.
      Specified by:
      findSingleFactor in class FactorAlgorithm
      Parameters:
      N - number to be factored.
      Returns:
      factor