[R] Time outside limits

[daniel]

Bart,

Check if the following could help you.

library(xts)
y <- c(rnorm(10,25), rnorm(10,32),rnorm(10,25), rnorm(10,20),
rnorm(10,25)); x <- seq(c(ISOdate(2000,3,20)), by = "hour", length.out =
length(y))
z <- xts( y, order.by=as.POSIXct(x))
limit <- ifelse( lag(z) < 22 | z > 27, 1, 0)


Daniel Merino

2014-10-16 15:12 GMT-03:00 Bart Joosen <bartjoosen at hotmail.com>:

> Hi,
> I'm currently facing the problem that I need to write a function where I
> get a dataframe back which contains the time (in hours) outside the limits
> of a temperature sensor, each month, and for how long exactly.
> I wrote a for loop which check:- if a datapoint is outside the limit- if
> the previous datapoint is outside the limt, then count + 1- if the next
> datapoint isn't outside: write in dataframe.
> I guess this could be with some vectorisation function, I tried with
> seq_along, and match, but couldn't figure it out.
> Here some sample data:
> y <- c(rnorm(10,25), rnorm(10,32),rnorm(10,25), rnorm(10,20),
> rnorm(10,25))x <- seq(c(ISOdate(2000,3,20)), by = "hour", length.out =
> length(y))
> limits of y: c(22,27)
> Thanks
> Bart
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Daniel

	[[alternative HTML version deleted]]