class ColumnVector {

  @Override
  public String toString() {
    final DecimalFormat format = FormatUtils.getDefaultDecimalFormat();
    final StringBuilder builder = new StringBuilder();

    for (int i = 0; i < this.size; ++i) {
      if (0 != i) {
        builder.append(" ");
      }

      builder.append(format.format(this.vector[i]));
    }

    return builder.toString();
  }

  public  ColumnVector(final int size);
  public  ColumnVector(final double... vector);
  private  ColumnVector(final Matrix matrix);

}