// Calculate the coordinates of points for graph plotting
for( int i=0; i<N; i++ ) {

	double x = X_MIN + i * DX; // X-coordinate of the i-th point

	// Wave A
	waveX[ 0 ][ i ] = x;
	waveY[ 0 ][ i ] = amplitudeA * sin( 2.0 * PI * ( t/periodA - x/wavelengthA ) );

	// Wave B
	waveX[ 1 ][ i ] = x;
	waveY[ 1 ][ i ] = amplitudeB * sin( 2.0 * PI * ( t/periodB - x/wavelengthB ) );

	// Composite Wave
	waveX[ 2 ][ i ] = x;
	waveY[ 2 ][ i ] = waveY[ 0 ][ i ] + waveY[ 1 ][ i ];
}

// Send the data to the graph
setGraph2DData( graph, waveX, waveY );