com.imsl.math
Class ComplexSparseMatrix.SparseArray

java.lang.Object
  com.imsl.math.ComplexSparseMatrix.SparseArray

All Implemented Interfaces:

Serializable

Enclosing class:

ComplexSparseMatrix

public static class ComplexSparseMatrix.SparseArray
extends Object
implements Serializable

The SparseArray class uses public fields to hold the data for a sparse matrix in the Java Sparse Array format. This format came about as a means for storing sparse matrices in Java. In this format, a sparse matrix is represented by two arrays of arrays. One array contains the references to the nonzero value arrays for each row of the sparse matrix. The other contains the references to the associated column index arrays.

As an example, consider the following complex sparse matrix:

In SparseArray, this matrix can be represented by the two jagged arrays, values and index, where values refers to the nonzero entries in A and index to the column indices:

            Complex values[][] = {
                        {new Complex(10.0, -3.0)},
                        {new Complex(10.0, 0.0), new Complex(-3.0, 2.0), new Complex(-1.0,-1.0)},
                        {new Complex(15.0, 5.0)},
                        {new Complex(-2.0, 0.0), new Complex(10.0, 1.0), new Complex(-1.0, -2.0)},
                        {new Complex(-1.0, 0.0), new Complex(-5.0, 7.0), new Complex(1.0, -3.0),
           new Complex(-3.0, 0.0)},
          {new Complex(-1.0, 4.0), new Complex(-2.0, 1.0), new Complex(6.0, -5.0)}
                }

                int index[][] = {
          {0}, 
          {1, 2, 3},
          {2},
          {0, 3, 4},
          {0, 3, 4, 5},
          {0, 1, 5}
      }
           

See Also:

Serialized Form

Field Summary

int[][]	index Jagged array containing column indices.
int	numberOfColumns Number of columns in the matrix.
long	numberOfNonZeros Number of nonzeros in the matrix.
int	numberOfRows Number of rows in the matrix.
Complex[][]	values Jagged array containing sparse array values.

Constructor Summary

ComplexSparseMatrix.SparseArray()

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

index

public int[][] index

Jagged array containing column indices. The length of this array equals numberOfRows. The length of each row equals the number of nonzeros in that row of the sparse matrix.

numberOfColumns

public int numberOfColumns

Number of columns in the matrix.

numberOfNonZeros

public long numberOfNonZeros

Number of nonzeros in the matrix.

numberOfRows

public int numberOfRows

Number of rows in the matrix.

values

public Complex[][] values

Jagged array containing sparse array values. This array must have the same shape as index.

Constructor Detail

ComplexSparseMatrix.SparseArray

public ComplexSparseMatrix.SparseArray()