Constructor Detail

• Permutation

  public Permutation​(int n)

  Create the identity permutation of the given size.

  Parameters:

  n - the size of the permutation

• Permutation

  public Permutation​(int[] perm)

  Create a permutation using the given permutation vector.

  Parameters:

  perm - the permutation vector

• Permutation

  public Permutation​(byte[] enc)

  Create a permutation from an encoded permutation.

  Parameters:

  enc - the encoded permutation

• Permutation

  public Permutation​(int n,
                     java.security.SecureRandom sr)

  Create a random permutation of the given size.

  Parameters:

  n - the size of the permutation

  sr - the source of randomness

Method Detail

• getEncoded

  public byte[] getEncoded()

  Encode this permutation as byte array.

  Returns:

  the encoded permutation

• getVector

  public int[] getVector()

  Returns:

  the permutation vector (perm(0),perm(1),...,perm(n-1))

• computeInverse

  public Permutation computeInverse()

  Compute the inverse permutation P^-1.

  Returns:

  this^-1

• rightMultiply

  public Permutation rightMultiply​(Permutation p)

  Compute the product of this permutation and another permutation.

  Parameters:

  p - the other permutation

  Returns:

  this * p

• equals

  public boolean equals​(java.lang.Object other)

  checks if given object is equal to this permutation.

  The method returns false whenever the given object is not permutation.

  Overrides:

  equals in class java.lang.Object

  Parameters:

  other - - permutation

  Returns:

  true or false

• toString

  public java.lang.String toString()

  Overrides:

  toString in class java.lang.Object

  Returns:

  a human readable form of the permutation

• hashCode

  public int hashCode()

  Overrides:

  hashCode in class java.lang.Object

  Returns:

  the hash code of this permutation