HiI'm fairly new to R and the list, so please take what I say
accordingly!Far as I can see, strptime gives you a string in some specified
format. In order to do any kind of numerically-based modelling with that, you
need to obtain a number to work with.One way to do this is by getting the time
with Sys.time() instead and coercing it to a number using as.integer():>
as.integer(Sys.time())I dare say you could also set up a structure in which
there are both numeric and string fields, do your modelling with the former and
labelling with the latter:> now=Sys.time()> numero=
as.integer(now)> dateo= format(now, "%a, %b %d, %Y")> timeo=
format (now, "%X")> item=list(numeric=numero,
strings=c(timeo,dateo))This seems to do the trick, and gives you a list with
values that look like this.> item$numeric[1] 1025176725$strings[1]
"12:18:45" "Thu, Jun 27, 2002"I guess many of us
might also choose to normalize the $numeric by subtracting some suitable base
date/time from each reading of numero, which appears to be the number of seconds
since 1/1/70, to give a more useful time origin!Nick Sherrard,
PhDreduplicativeblending at
yahoo.co.uk______________________________________________________Subject: [R]
lattice and datesI've got some data that is recorded at various times during
theday. I create a time stamp is created from date and timestrings like this:
> timestamp xyplot( value ~ timestamp | subject )This fails with Error in
as.double.default(x) : (list) object cannot be coerced to vector type 14 In
addition: Warning message: Both x and y should be numeric in: xyplot( value ~
timestamp | subject )I was sure I saw something like this on r-help recently,
but Ican't seem to track it down now. Can anyone help me out?Thanks, Mike-
-- Michael A. Miller mmiller3 at iupui.edu
Imaging Sciences, Department of Radiology, IU School of Medicine-
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