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    <p>How about x = 1 - x? Or if you want it to be time based use Timer % 2</p> <p>Oh, you wanted the values between 0 and 1 as well. how about Math.Abs(100 - (Timer % 200)) / 100 Where timer is something like DateTime.Now.TimeOfDay.TotalMilliseconds</p> <p><strong>Edit:</strong> My tests indicate that this is more than twice as fast as the Sin method. For 1 million iterations, the sin method takes .048 seconds while the Abs method takes about .023 seconds. Also, you get different waveforms out of the two, of course. Sin produces a Sine wave, while Abs produces a triangular wave.</p> <pre><code>static void Main(string[] args) { System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch(); sw.Start(); const int count = 1000000; float[] results = new float[count]; for (int i = 0; i &lt; count; i++) { results[i] = AbsPulse(i/1000000F); //results[i] = SinPulse(i / 1000000F); } sw.Stop(); Console.WriteLine("Time Elapsed: {0} seconds", sw.Elapsed.TotalSeconds); char[,] graph = new char[80, 20]; for (int y = 0; y &lt;= graph.GetUpperBound(1); y++) for (int x = 0; x &lt;= graph.GetUpperBound(0); x++) graph[x, y] = ' '; for (int x = 0; x &lt; count; x++) { int col = x * 80 / count; graph[col, (int)(results[x] * graph.GetUpperBound(1))] = 'o'; } for (int y = 0; y &lt;= graph.GetUpperBound(1); y++) { for (int x = 0; x &lt; graph.GetUpperBound(0); x++) Console.Write(graph[x, y]); Console.WriteLine(); } } static float AbsPulse(float time) { const int frequency = 10; // Frequency in Hz const int resolution = 1000; // How many steps are there between 0 and 1 return Math.Abs(resolution - ((int)(time * frequency * 2 * resolution) % (resolution * 2))) / (float)resolution; } static float SinPulse(float time) { const float pi = 3.14F; const float frequency = 10; // Frequency in Hz return 0.5F * (1 + (float)Math.Sin(2 * pi * frequency * time)); } </code></pre>
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