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 (Ti - 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