`hctsa`

`R/compengine.R`

`firstmin_ac.Rd`

Time of first minimum in the autocorrelation function from software package `hctsa`

```
firstmin_ac(
x,
acfv = stats::acf(x, lag.max = N - 1, plot = FALSE, na.action = na.pass)
)
```

- x
the input time series

- acfv
vector of autocorrelation, if exist, used to avoid repeated computation.

The lag of the first minimum

B.D. Fulcher and N.S. Jones. hctsa: A computational framework for automated time-series phenotyping using massive feature extraction. Cell Systems 5, 527 (2017).

B.D. Fulcher, M.A. Little, N.S. Jones Highly comparative time-series analysis: the empirical structure of time series and their methods. J. Roy. Soc. Interface 10, 83 (2013).

```
firstmin_ac(WWWusage)
#> [1] 21
```