tmove

Syntax

tmove(T, X, window)

Arguments

T is a non-strictly increasing vector of temporal or integral type. It cannot contain NULL values.

X is a vector with the same length as T.

window is a positive integer or DURATION type.

Details

For each element T _i in T, return the element in X which is at the same position as (T _i-window) in T. If there is no match of (T _i - window) in T, return the corresponding element in X at the previous adjacent time of (T _i - window).

Examples

$ T = 1 1 1 2 5 6
$ X = 1 4 NULL -1 NULL 4
$ m = table(T as t,X as x)
$ select *, tmove(t, x, 3) from m

t	x	tmove_t
1	1
1	4
1
2	-1
5		-1
6	4	-1

$ T = 2021.01.02 2021.01.02  2021.01.04  2021.01.05 2021.01.07 2021.01.09
$ X = 5 4 NULL -1 2 4
$ m = table(T as t,X as x)
$ select *, tmove(t, x, 3d) from m

t	x	tmove_t
2021.01.02	5
2021.01.02	4
2021.01.04
2021.01.05	-1	4
2021.01.07	2
2021.01.09	4	-1

$ select *, tmove(t, x, 1w) from m

t	x	tmove_t
2021.01.02	5
2021.01.02	4
2021.01.04
2021.01.05	-1
2021.01.07	2
2021.01.09	4	4

Related function: move