I have absolutely no idea on how to calculate the difference between previous and current value of a tall array column.

What I try to do: I have a tall array column with a timestamp. Now to make different calculations I want also a tall array column with the delta timestamp (current timestamp - previous timestamp).

As it is not possible to do this in a loop, I have no idea on how to do this.

Can somebody assist me please? Thanks

CodePudding user response：

You can just use diff

Assuming you're using the word "tall" in its technical sense (i.e. tall arrays) then diff is in the function list for compatable out-of-memory functions for use with tall data.