Polychromatic Momentum Indicator
Polychromatic Momentum is a generalized Momentum study considering a number of Momentum values controlled by the length input. The greatest weight is given to the most recent Momentum value, while the precedent values are given lesser weight. Each Momentum value is assigned weight equal to inverse square root of Momentum distance (number of bars prior to the current bar). Then the sum of the weighted Momentum values is divided by the sum of the square roots.