Tips on traversing/altering time-ordered cols

Using one or more of the special purpose array types / time series / time-orderable data packages, I want to touch and sometimes spread or enfold or smooth or roughen the contents of one column using itself and using one or more other columns. I did this sort of thing in R.

A good start is knowing the best use for each of current specializations of array and so too with the current and evolving packages designed with support for time series or time sequences. Outside of the performance guides, I have not worked with Julia’s principled techniques in this domain.