Cant find Momentum technical indicator

[MarkFx]

Hello,
Please, How can I use Momentum technical indicator?
I tried, but still I cant find it.
Can you help me or do you have some more examples?
Many thanks for answer
Mark

[ssathya]

candles.Add(new Candle(
						//dateTime: Datetime of trading day/hour/minute/second,
						open: (decimal)Math.Log((double)cand.Open),
						high: (decimal)Math.Log((double)cand.High),
						low: (decimal)Math.Log((double)cand.Low),
						close: (decimal)Math.Log((double)cand.Close),
						cand.Volume)
						);

Now momentum: I'm looking only for the last value.

var mom = candles.Mtm();
if (mom != null && mom.Count != 0)
			{
				var computedValues = mom.Last();
				var returnValues = new MomentumValues
				{
					Symbol = ticker,
					ComputeDate = computeTime.ToUnixTimeSeconds(),
					Momentum = (double)(computedValues.Tick)
				};
				return returnValues;
			}