tmcount

语法

tmcount(T, X, window)

参数说明和窗口计算规则请参考:tmFunctions

详情

在给定长度(以时间 T 衡量)的滑动窗口内统计 X 中的非 NULL 元素个数。

例子

T = 1 1 1 2 5 6
X = 1 4 NULL -1 NULL 4
m = table(T as t,X as x)
select *, tmcount(t, x, 3) from m
t x tmcount_t
1 1 1
1 4 2
1 2
2 -1 3
5 0
6 4 1
T = 2021.01.02 2021.01.02  2021.01.04  2021.01.05 2021.01.07 2021.01.09
X = NULL 4 NULL -1 2 4
m = table(T as t,X as x)
select *, tmcount(t, x, 3d) from m
t x tmcount_t
2021.01.02 0
2021.01.02 4 1
2021.01.04 1
2021.01.05 -1 1
2021.01.07 2 2
2021.01.09 4 2
select *, tmcount(t, x, 1w) from m
t x tmcount_t
2021.01.02 0
2021.01.02 4 1
2021.01.04 1
2021.01.05 -1 2
2021.01.07 2 3
2021.01.09 4 3

相关函数:mcount, count