mfirst
Syntax
mfirst(X, window, [minPeriods])
Please see mFunctions for the parameters and windowing logic.
Details
Return the first element of X in a sliding window.
Examples
index = second(08:20:00)+1..7
x = 2 1 3 NULL 6 5 4
x = index.indexedSeries(x)
mfirst(x,3s)| label | col1 |
|---|---|
| 08:20:01 | 2 |
| 08:20:02 | 2 |
| 08:20:03 | 2 |
| 08:20:04 | 1 |
| 08:20:05 | 3 |
| 08:20:06 | |
| 08:20:07 | 6 |
m = matrix(1 5 9 0 2, 9 10 2 NULL 2)
m.rename!((date(2020.09.08)+1..3) join 2020.09.16 join 2020.09.26, `A`B)
m.setIndexedMatrix!()
mfirst(m, 3d)| label | A | B |
|---|---|---|
| 2020.09.09 | 1 | 9 |
| 2020.09.10 | 1 | 9 |
| 2020.09.11 | 1 | 9 |
| 2020.09.16 | 0 | |
| 2020.09.26 | 2 | 2 |
mfirst(m, 1w)| label | A | B |
|---|---|---|
| 2020.09.09 | 1 | 9 |
| 2020.09.10 | 1 | 9 |
| 2020.09.11 | 1 | 9 |
| 2020.09.16 | 5 | 10 |
| 2020.09.26 | 2 | 2 |