Sliding Time Window Function

*To*: mathgroup at smc.vnet.net*Subject*: [mg122110] Sliding Time Window Function*From*: northern_flicker <max_kip at hotmail.com>*Date*: Fri, 14 Oct 2011 05:54:30 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

Dear Forum This problem is quite similar to a moving average, but it has two differences, which I am struggling to overcome. It is applicable to a heterogeneous time series with dependent x and y values, i.e., {time, x, y}, where the temporal variations in x and y are of interest. 1) It would be preferable to have a sliding window based on a time interval rather than the number of data, e.g., 0.5 s, 5 min., 50 years, etc. 2) Instead of a moving average I would like to apply some expression over the moving time interval that uses both x and y, e.g., Total[Cos(x)*Sin(y)]/Total[Cos(x)*Cos(y)] A fresh approach would be much appreciated