Mathematical
Operations On Indicators
Some purely
mathematical operations, found to be useful for development of neural
network trading systems, have also been provided and are listed below.

Detrend by Least Squares

Detrend by First Differences.
Same as differentiation

FFT of Indicator.
Good for detecting cycles in market behavior.

Limit and Set to Zero
(LIM) This operation is useful for eliminating outliers

Summation (SUM). Same
as integration

Multiply by a Scale
Factor

Add (or subtract)
a Bias
Moving
averages
