question: @ Override public Instance generateExample ( ) throws Exception { Instance result ; Random rand ; double x ; double y ; double [ ] atts ; result = null ; rand = getRandom ( ) ; if ( m_DatasetFormat == null ) { throw new Exception ( "Dataset format not defined." ) ; } atts = new double [ m_DatasetFormat . numAttributes ( ) ] ; x = rand . nextDouble ( ) ; x = x * ( getMaxRange ( ) - getMinRange ( ) ) + getMinRange ( ) ; if ( Utils . eq ( x , 0 ) ) { y = getAmplitude ( ) ; } else { y = getAmplitude ( ) * StrictMath . sin ( StrictMath . abs ( x ) ) / StrictMath . abs ( x ) ; } y = y + getAmplitude ( ) * m_NoiseRandom . nextGaussian ( ) * getNoiseRate ( ) * getNoiseVariance ( ) ; atts [ 0 ] = x ; atts [ 1 ] = y ; result = new DenseInstance ( 1.0 , atts ) ; result . setDataset ( m_DatasetFormat ) ; return result ; }
target:  Generates one example of the dataset.