Nothing

```
## the fromtoby-vector form is intended to give users
## a compact representation of time steps without the need to apply
## time series classes as "ts" or "zoo"
## "fromtoby" vectors are optional, ordinary sequences are possible too
## check for from-to-by structure of vector
isfromtoby <- function(x) {
(sum(names(x) %in% c("from","to","by"))==3)
}
hasfromtoby <- function(x) {
any(names(x) %in% c("from","to","by"))
}
## expand from-to-by-vector to sequence
fromtoby <- function(times) {
if (isfromtoby(times)) {
times <- seq(times["from"], times["to"], times["by"])
}
times
}
```

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