[R] appending objects to a file created by save()
Hi, I've been slowly transitioning to saving sets of objects for a project using save() rather than cluttering my workspace and then doing save.image() However, sometimes after I have done say: save(x,y,z, file='work.Rda') and I reload it a little later and I see that I also want to save object p. Currently I need to do: save(x,y,z,p, file='work.Rda') Is there any way to instruct save to append an object to a previously created binary data file? Thanks, --- Rajarshi Guha [EMAIL PROTECTED] http://jijo.cjb.net GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE --- CChheecckk yyoouurr dduupplleexx sswwiittcchh.. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] appending objects to a file created by save()
On Fri, 10 Mar 2006, Rajarshi Guha wrote: Hi, I've been slowly transitioning to saving sets of objects for a project using save() rather than cluttering my workspace and then doing save.image() However, sometimes after I have done say: save(x,y,z, file='work.Rda') and I reload it a little later and I see that I also want to save object p. Currently I need to do: save(x,y,z,p, file='work.Rda') Is there any way to instruct save to append an object to a previously created binary data file? No. The save() format is not a concatenated set of objects. It is a serialized version of a single object, the R list of the objects named on the save() call. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] appending objects to a file created by save()
On Fri, 2006-03-10 at 03:46 -0500, Rajarshi Guha wrote:
Hi,
I've been slowly transitioning to saving sets of objects for a project
using save() rather than cluttering my workspace and then doing
save.image()
However, sometimes after I have done say:
save(x,y,z, file='work.Rda')
and I reload it a little later and I see that I also want to save
object p. Currently I need to do:
save(x,y,z,p, file='work.Rda')
Is there any way to instruct save to append an object to a previously
created binary data file?
I use this approach. One potential problem with this approach is that if
you have large saved objects you could get into problems because you
need to load them before saving them.
## Function to append an object to an R data file.
append.Rda - function(x, file) {
old.objects - load(file, new.env())
save(list = c(old.objects, deparse(substitute(x))), file = file)
}
## Example:
x - 1:10
y - letters[1:10]
save(list = c(x, y), file = temp.Rda)
z - fred
append.Rda(z, temp.Rda)
Dave
Thanks,
---
Rajarshi Guha [EMAIL PROTECTED] http://jijo.cjb.net
GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE
---
CChheecckk yyoouurr dduupplleexx sswwiittcchh..
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
__
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Re: [R] appending objects to a file created by save()
Another flexible approach is to zip/tar all the required individual .rda
files together. There are two advantages that I see :
1) You can extract a single file from the collection if you want.
2) You can easily list what objects are in the zipped/tarred file.
In R you have to load all object from a single .rda if you want to
extract a single object or even to list what objects are stored.
In terms of size, the zipped/tarred file gives comparable if not smaller
size than R's function save() with compress=TRUE option. But I have
tested this feature in depth.
Regards, Adai
On Fri, 2006-03-10 at 09:49 +, David Whiting wrote:
On Fri, 2006-03-10 at 03:46 -0500, Rajarshi Guha wrote:
Hi,
I've been slowly transitioning to saving sets of objects for a project
using save() rather than cluttering my workspace and then doing
save.image()
However, sometimes after I have done say:
save(x,y,z, file='work.Rda')
and I reload it a little later and I see that I also want to save
object p. Currently I need to do:
save(x,y,z,p, file='work.Rda')
Is there any way to instruct save to append an object to a previously
created binary data file?
I use this approach. One potential problem with this approach is that if
you have large saved objects you could get into problems because you
need to load them before saving them.
## Function to append an object to an R data file.
append.Rda - function(x, file) {
old.objects - load(file, new.env())
save(list = c(old.objects, deparse(substitute(x))), file = file)
}
## Example:
x - 1:10
y - letters[1:10]
save(list = c(x, y), file = temp.Rda)
z - fred
append.Rda(z, temp.Rda)
Dave
Thanks,
---
Rajarshi Guha [EMAIL PROTECTED] http://jijo.cjb.net
GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE
---
CChheecckk yyoouurr dduupplleexx sswwiittcchh..
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
