import cern.colt.matrix.tfloat.FloatMatrix2D;
   import cern.colt.matrix.tfloat.algo.SparseFloatAlgebra;
   import cern.colt.matrix.tfloat.impl.SparseFloatMatrix2D;
   
   /**
    * Demonstrate the COLT Matrix must be sparse problem.
    * <p>
    * Copyright (c) 2013-2014 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
    * BSD-style license. See <a href="http://opentrafficsim.org/node/13">OpenTrafficSim License</a>.
   * <p>
   * @version Aug 26, 2014 <br>
   * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
   */
  public class SparseMatrixProblem
  {
  
      /**
       * Execute the demo.
       * @param args String[]; not used
       */
      public static void main(final String[] args)
      {
          float[][] values = { {1, 2, 3}, {3, 5, 7}, {5, 10, 0}};
          Float determinant = null;
  
          FloatMatrix2D floatMatrix2D = new SparseFloatMatrix2D(values.length, values[0].length);
          for (int row = 0; row < values.length; row++)
          {
              for (int column = 0; column < values[row].length; column++)
              {
                  floatMatrix2D.set(row, column, values[row][column]);
              }
          }
          System.out.println("matrix: " + floatMatrix2D.toString());
          System.out.println("calling SparseFloatAlgebra().det(this.matrixSI)");
          try
          {
              determinant = new SparseFloatAlgebra().det(floatMatrix2D);
          }
          catch (IllegalArgumentException exception)
          {
              exception.printStackTrace();
          }
          System.out.println("determinant is " + determinant + " (should be 15.0)");
      }
  }