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chron blues
3 messages · Bernie McConnell, Peter Dalgaard, Kurt Hornik
Bernie McConnell <bm8 at st-andrews.ac.uk> writes:
GoodDay, Could someone please tell me why b (below) does not return a vector of 10 chron objects? Hopefuly I am being remarkably naive or have missed something obvious in the chron documentation. I'm running Win NT 4.0
I don't think you're particularly naive...
The root of this seems to be this
Browse[1]> unclass(e1)+c(1.5,1.5)
[1] 3658.5 3658.5
Browse[1]> unclass(e1)+c(1.5)
[1] 3658.5
attr(,"format")
[1] "d/m/y" "h:m:s"
attr(,"origin")
month day year
1 1 1970
This is a generic issue, recycling kills attributes:
x<-1 attr(x,"foo")<-"bar" x+1
[1] 2 attr(,"foo") [1] "bar"
x+1:2
[1] 2 3 I forget whether there's a logic to this, but S-Plus 3.4 is doing the same thing. Hence, Ops.dates inside chron probably needs fixing. Specifically at the line val <- NextMethod(.Generic) (original problem:)
library(chron)
gps.start.date <<- chron("06/01/80",
+ "00:00:00",
+ format=c("d/m/y","h:m:s"))
..
<bold>> b <<- gps.start.date + rep(1.5,10)
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Peter Dalgaard BSA writes:
Bernie McConnell <bm8 at st-andrews.ac.uk> writes:
GoodDay, Could someone please tell me why b (below) does not return a vector of 10 chron objects? Hopefuly I am being remarkably naive or have missed something obvious in the chron documentation. I'm running Win NT 4.0
I don't think you're particularly naive... The root of this seems to be this
Browse[1]> unclass(e1)+c(1.5,1.5)
[1] 3658.5 3658.5
Browse[1]> unclass(e1)+c(1.5)
[1] 3658.5
attr(,"format")
[1] "d/m/y" "h:m:s"
attr(,"origin")
month day year
1 1 1970
This is a generic issue, recycling kills attributes:
x<-1 attr(x,"foo")<-"bar" x+1
[1] 2 attr(,"foo") [1] "bar"
x+1:2
[1] 2 3
I forget whether there's a logic to this, but S-Plus 3.4 is doing the same thing. Hence, Ops.dates inside chron probably needs fixing. Specifically at the line
val <- NextMethod(.Generic)
(original problem:)
library(chron)
gps.start.date <<- chron("06/01/80",
+ "00:00:00",
+ format=c("d/m/y","h:m:s"))
..
<bold>> b <<- gps.start.date + rep(1.5,10)
Thanks for spotting this, Peter.
Bernie, could we convince you to use the date/time features added to R
1.2.0 instead?
R> as.POSIXct("1980-06-01") + rep(1.5,10)
[1] "1980-06-01 00:00:01" "1980-06-01 00:00:01" "1980-06-01 00:00:01"
[4] "1980-06-01 00:00:01" "1980-06-01 00:00:01" "1980-06-01 00:00:01"
[7] "1980-06-01 00:00:01" "1980-06-01 00:00:01" "1980-06-01 00:00:01"
[10] "1980-06-01 00:00:01"
works without any problems ... (although you perhaps want to add 1.5
days rather than seconds)
-k
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