Hello,
I am trying to write some code that dumps R objects to the harddisk in a binary
format so they can be quickly re-used later. Goal is to save time. The objects
may be quite large (e.g. classes for a GUI). I was thinking that save() and
load() would be suitable for this (until now I only thought it could be used
for 'real' data, e.g. matrices, data.frames etc), but I am hoping any object
can be 'marshalled' using these functions. Probably I am doing something wrong
in the unmarshal() function, perhaps with assign().
Thank you in advance!
AJ
#########
# Creation of test data
#########
setClass(
Class="Test",
representation=representation(
amounts="data.frame"
)
)
setMethod(
f="initialize",
signature="Test",
definition=function(.Object, amounts){
.Object@amounts <- amounts
return(.Object)
}
)
setGeneric (
name="doStuff",
def=function(.Object){standardGeneric("doStuff")}
)
setMethod(
f = "doStuff",
signature = "Test",
definition=function(.Object) {
return(mean(.Object@amounts, na.rm=TRUE))
}
)
print( objects() )
instance <- new(Class="Test", data.frame(amount=runif(10, 0, 10)))
doStuff(instance)
#########
# actual code (incomplete)
#########
marshal <- function(object) {
fn <- file.path(Sys.getenv()["TEMP"], paste(object, ".xdr", sep=""))
save(object, file=fn, compress=FALSE)
print(sprintf("Saving %s", fn))
}
unmarshal <- function(xdr) {
object <- strsplit(strsplit(xdr, "\\.")[[1]][[1]], "/")
object <- object[[1]][length(object[[1]])]
assign(object, load(xdr))
print(sprintf("Loading %s", xdr))
}
print(objects())
lapply(c("doStuff", "instance"), marshal)
rm(list=c("doStuff", "instance"))
xdrs <- Sys.glob(file.path(Sys.getenv()["TEMP"], "*.xdr"))
lapply(xdrs, unmarshal)
print(objects()) ## doStuff and instance do not appear! :-(
Cheers!!
Albert-Jan
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