Package de.tilman_neumann.jml.base

Class BigIntTriangle

java.lang.Object
de.tilman_neumann.jml.base.BigIntTriangle
Direct Known Subclasses:
EgyptianFractionsTriangle
public class BigIntTriangle
extends java.lang.Object
A triangle of integers.

  • Constructor Summary

    Constructors
    Constructor Description
    BigIntTriangle()
    Create a triangle without data.
    BigIntTriangle​(int n, java.math.BigInteger init)
    Creates an initialized number triangle with n rows.

  • Method Summary

    Modifier and Type Method Description
    void addRow​(java.util.ArrayList<java.math.BigInteger> row)  
    java.math.BigInteger get​(int n, int k)
    Returns the entry T[n,k], with T[1,1] being the very first element.
    java.util.ArrayList<java.math.BigInteger> getRow​(int n)
    return n.th row, where the first row has index 1.
    java.math.BigInteger getRowSum​(int n)
    Returns the sum over all entries of the n.th row, where the first row has index 1.
    java.util.ArrayList<java.math.BigInteger> getRowSums()  
    void set​(int n, int k, java.math.BigInteger value)
    Sets the value T[n,k].
    java.util.ArrayList<java.math.BigInteger> toList()  
    java.lang.String toString()  

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • BigIntTriangle

      public BigIntTriangle()
      Create a triangle without data. Rows may be added with the addRow() method.

    • BigIntTriangle

      public BigIntTriangle​(int n, java.math.BigInteger init)
      Creates an initialized number triangle with n rows.
      Parameters:
      n -
      init - The value with which the triangle entries are initialized.

  • Method Details

    • get

      public java.math.BigInteger get​(int n, int k)
      Returns the entry T[n,k], with T[1,1] being the very first element.
      Parameters:
      n -
      k -
      Returns:
      T[n,k]

    • set

      public void set​(int n, int k, java.math.BigInteger value)
      Sets the value T[n,k].
      Parameters:
      n -
      k -
      value -

    • addRow

      public void addRow​(java.util.ArrayList<java.math.BigInteger> row)

    • getRow

      public java.util.ArrayList<java.math.BigInteger> getRow​(int n)
      return n.th row, where the first row has index 1.
      Parameters:
      n -
      Returns:
      n.th row

    • getRowSum

      public java.math.BigInteger getRowSum​(int n)
      Returns the sum over all entries of the n.th row, where the first row has index 1.
      Parameters:
      n -
      Returns:
      the sum over all entries of the n.th row

    • getRowSums

      public java.util.ArrayList<java.math.BigInteger> getRowSums()
      Returns:
      List of row sums of this triangle.

    • toList

      public java.util.ArrayList<java.math.BigInteger> toList()
      Returns:
      This triangle converted into a list read by rows. Better suited for OEIS lookups.

    • toString

      public java.lang.String toString()
      Overrides:
      toString in class java.lang.Object