tmfirst

Syntax

tmfirst(T, X, window)

Please see tmFunctions for the parameters and windowing logic.

Details

Return the first element of X in a sliding 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 *, tmfirst(t, x, 3) from m
t x tmfirst_t
1 1 1
1 4 1
1 1
2 -1 1
5
6 4
T = 2021.01.02 2021.01.02  2021.01.04  2021.01.05 2021.01.07 2021.01.08
X = 3 4 NULL -1 2 4
m = table(T as t,X as x)
select *, tmfirst(t, x, 3d) from m
t x tmfirst_t
2021.01.02 3 3
2021.01.02 4 3
2021.01.04 3
2021.01.05 -1
2021.01.07 2 -1
2021.01.08 4 2
select *, tmfirst(t, x, 1w) from m
t x tmfirst_t
2021.01.02 3 3
2021.01.02 4 3
2021.01.04 3
2021.01.05 -1 3
2021.01.07 2 3
2021.01.08 4 3

Related functions: first