Re: [R] save an object by dynamicly created name
saveObject() and loadObject() are using save() and load() in base.
The default is to compress the data when saving, which take some time.
Using saveObject(..., compress=FALSE) is probably faster, but takes
up more disk space. ...and make sure you don't work towards a file
system over a network, because that can slow things down (doesn't
sound like you do).
/H
On Sun, Nov 8, 2009 at 6:26 AM, Hao Cen h...@andrew.cmu.edu wrote:
Hi Henrik,
I am using your saveObject/loadObject to handle over 1000 matrices. It
worked beautifully. Because I need to load those matrices often for
evaluating a few functions on them and those matrices do not fit all in
memory at once, is there a way to speed up the loading part? I tried save
all the binary files to /dev/shm (shared memory section in linux) but the
speed of loadObject on /dev/shm remains the same as on the disk.
Thanks
Hao
-Original Message-
From: henrik.bengts...@gmail.com [mailto:henrik.bengts...@gmail.com] On
Behalf Of Henrik Bengtsson
Sent: Monday, November 02, 2009 12:34 AM
To: David Winsemius
Cc: r-help@r-project.org; jeffc
Subject: Re: [R] save an object by dynamicly created name
On Sun, Nov 1, 2009 at 9:18 PM, David Winsemius dwinsem...@comcast.net
wrote:
On Nov 1, 2009, at 11:28 PM, Henrik Bengtsson wrote:
On Sun, Nov 1, 2009 at 7:48 PM, David Winsemius dwinsem...@comcast.net
wrote:
On Nov 1, 2009, at 10:16 PM, Henrik Bengtsson wrote:
path - data;
dir.create(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
pathname - file.path(path, filename);
save(m, file=pathname);
}
That would result in each of the ten files containing an object with the
same name == m. (Also on my system R data files have type Rdta.) So I
thought what was requested might have been a slight mod:
path - ~/;
dir.create(path);
for (i in 1:10) {
assign( paste(m, i, sep=), i:5)
filename - sprintf(m%02d.Rdta, i)
pathname - file.path(path, filename)
obj =get(paste(m, i, sep=))
save(obj, file=pathname)
}
Then a more convenient solution is to use saveObject() and
loadObject() of R.utils. saveObject() does not save the name of the
object save.
The OP asked for this outcome :
I would like to save m as m1, m2, m3 ...,
to file /home/data/m1, /home/data/m2, home/data/m3, ...
If you want to save multiple objects, the wrap them up
in a list.
I agree that a list would makes sense if it were to be stored in one file
,
although it was not what requested.
That comment was not for the OP, but for saveObject()/loadObject() in
general.
But wouldn't that require assign()-ing a name before list()-wrapping?
Nope, the whole point of using saveObject()/loadObject() is to save
the objects/values without their names that you happens to choose in
the current session, and to avoid overwriting existing ones in your
next session. My example could also have been:
library(R.utils);
saveObject(list(a=1,b=LETTERS,c=Sys.time()), file=foo.Rbin);
y - loadObject(foo.Rbin);
z - loadObject(foo.Rbin);
stopifnot(identical(y,z));
If you really want to attach the elements of the saved list, do:
attachLocally(loadObject(foo.Rbin));
str(a)
num 1
str(b)
chr [1:26] A B C D E F G H I J ...
str(c)
POSIXct[1:1], format: 2009-11-01 21:30:41
I suppose we ought to mention that the use of assign to create a variable
is
a FAQ ... 7.21? Yep, I have now referred to it a sufficient number of
times
to refer to it by number.
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-
variable_003f
My personal take on assign() and get() is that if you find yourself
using them (at this level), there is a good chance there exists a
better solution that you should use instead.
My $.02
/H
--
David
loadObject() does not assign variable, but instead return
them. Example:
library(R.utils);
x - list(a=1,b=LETTERS,c=Sys.time());
saveObject(x, file=foo.Rbin);
y - loadObject(foo.Rbin);
stopifnot(identical(x,y));
So, for the original example, I'd recommend:
library(R.utils);
path - data;
mkdirs(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
saveObject(m, file=filename, path=path);
}
and loading the objects back as:
for (i in 1:10) {
filename - sprintf(m%02d.Rbin, i);
m - loadObject(filename, path=path);
print(m);
}
/Henrik
--
David.
/H
On Sun, Nov 1, 2009 at 6:53 PM, jeffc h...@andrew.cmu.edu wrote:
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to save m
as
m1,
m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
I tried a couple of methods on translating between object names and
strings
(below) but couldn't get it to work.
https://stat.ethz.ch/pipermail/r-help/2008-November/178965.html
Re: [R] save an object by dynamicly created name
Hi Henrik,
I am using your saveObject/loadObject to handle over 1000 matrices. It
worked beautifully. Because I need to load those matrices often for
evaluating a few functions on them and those matrices do not fit all in
memory at once, is there a way to speed up the loading part? I tried save
all the binary files to /dev/shm (shared memory section in linux) but the
speed of loadObject on /dev/shm remains the same as on the disk.
Thanks
Hao
-Original Message-
From: henrik.bengts...@gmail.com [mailto:henrik.bengts...@gmail.com] On
Behalf Of Henrik Bengtsson
Sent: Monday, November 02, 2009 12:34 AM
To: David Winsemius
Cc: r-help@r-project.org; jeffc
Subject: Re: [R] save an object by dynamicly created name
On Sun, Nov 1, 2009 at 9:18 PM, David Winsemius dwinsem...@comcast.net
wrote:
On Nov 1, 2009, at 11:28 PM, Henrik Bengtsson wrote:
On Sun, Nov 1, 2009 at 7:48 PM, David Winsemius dwinsem...@comcast.net
wrote:
On Nov 1, 2009, at 10:16 PM, Henrik Bengtsson wrote:
path - data;
dir.create(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
pathname - file.path(path, filename);
save(m, file=pathname);
}
That would result in each of the ten files containing an object with the
same name == m. (Also on my system R data files have type Rdta.) So I
thought what was requested might have been a slight mod:
path - ~/;
dir.create(path);
for (i in 1:10) {
assign( paste(m, i, sep=), i:5)
filename - sprintf(m%02d.Rdta, i)
pathname - file.path(path, filename)
obj =get(paste(m, i, sep=))
save(obj, file=pathname)
}
Then a more convenient solution is to use saveObject() and
loadObject() of R.utils. saveObject() does not save the name of the
object save.
The OP asked for this outcome :
I would like to save m as m1, m2, m3 ...,
to file /home/data/m1, /home/data/m2, home/data/m3, ...
If you want to save multiple objects, the wrap them up
in a list.
I agree that a list would makes sense if it were to be stored in one file
,
although it was not what requested.
That comment was not for the OP, but for saveObject()/loadObject() in
general.
But wouldn't that require assign()-ing a name before list()-wrapping?
Nope, the whole point of using saveObject()/loadObject() is to save
the objects/values without their names that you happens to choose in
the current session, and to avoid overwriting existing ones in your
next session. My example could also have been:
library(R.utils);
saveObject(list(a=1,b=LETTERS,c=Sys.time()), file=foo.Rbin);
y - loadObject(foo.Rbin);
z - loadObject(foo.Rbin);
stopifnot(identical(y,z));
If you really want to attach the elements of the saved list, do:
attachLocally(loadObject(foo.Rbin));
str(a)
num 1
str(b)
chr [1:26] A B C D E F G H I J ...
str(c)
POSIXct[1:1], format: 2009-11-01 21:30:41
I suppose we ought to mention that the use of assign to create a variable
is
a FAQ ... 7.21? Yep, I have now referred to it a sufficient number of
times
to refer to it by number.
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-
variable_003f
My personal take on assign() and get() is that if you find yourself
using them (at this level), there is a good chance there exists a
better solution that you should use instead.
My $.02
/H
--
David
loadObject() does not assign variable, but instead return
them. Example:
library(R.utils);
x - list(a=1,b=LETTERS,c=Sys.time());
saveObject(x, file=foo.Rbin);
y - loadObject(foo.Rbin);
stopifnot(identical(x,y));
So, for the original example, I'd recommend:
library(R.utils);
path - data;
mkdirs(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
saveObject(m, file=filename, path=path);
}
and loading the objects back as:
for (i in 1:10) {
filename - sprintf(m%02d.Rbin, i);
m - loadObject(filename, path=path);
print(m);
}
/Henrik
--
David.
/H
On Sun, Nov 1, 2009 at 6:53 PM, jeffc h...@andrew.cmu.edu wrote:
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to save m
as
m1,
m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
I tried a couple of methods on translating between object names and
strings
(below) but couldn't get it to work.
https://stat.ethz.ch/pipermail/r-help/2008-November/178965.html
http://tolstoy.newcastle.edu.au/R/help/04/08/2673.html
Any suggestions would be appreciated.
thanks
Hao
--
View this message in context:
http://old.nabble.com/save-an-object-by-dynamicly-created-name-tp26155437p26
155437.html
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__
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http://www.R
Re: [R] save an object by dynamicly created name
jeffc wrote:
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to save m as
m1, m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
save(m, file = paste(/home/data/m, i, .rdata, sep=)
Dieter
--
View this message in context:
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__
R-help@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.
Re: [R] save an object by dynamicly created name
Hi Henrik and David,
Thank you very much for your suggestions. I found both meet my needs.
In the following code, I found save(obj,file=pathname) would save the
content into an object called obj.
path - ~/;
dir.create(path);
for (i in 1:10) {
assign( paste(m, i, sep=), i:5)
filename - sprintf(m%02d.Rdta, i)
pathname - file.path(path, filename)
obj =get(paste(m, i, sep=))
save(obj, file=pathname)
}
A tweak to this would be
path - ~/;
dir.create(path);
for (i in 1:10) {
assign( paste(m, i, sep=), i:5)
filename - sprintf(m%02d.Rdta, i)
pathname - file.path(path, filename)
save(list = paste(m, i, sep=), file=pathname)
}
Thanks a lot
Hao
-Original Message-
From: henrik.bengts...@gmail.com [mailto:henrik.bengts...@gmail.com] On
Behalf Of Henrik Bengtsson
Sent: Monday, November 02, 2009 12:34 AM
To: David Winsemius
Cc: r-help@r-project.org; jeffc
Subject: Re: [R] save an object by dynamicly created name
On Sun, Nov 1, 2009 at 9:18 PM, David Winsemius dwinsem...@comcast.net
wrote:
On Nov 1, 2009, at 11:28 PM, Henrik Bengtsson wrote:
On Sun, Nov 1, 2009 at 7:48 PM, David Winsemius dwinsem...@comcast.net
wrote:
On Nov 1, 2009, at 10:16 PM, Henrik Bengtsson wrote:
path - data;
dir.create(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
pathname - file.path(path, filename);
save(m, file=pathname);
}
That would result in each of the ten files containing an object with the
same name == m. (Also on my system R data files have type Rdta.) So I
thought what was requested might have been a slight mod:
path - ~/;
dir.create(path);
for (i in 1:10) {
assign( paste(m, i, sep=), i:5)
filename - sprintf(m%02d.Rdta, i)
pathname - file.path(path, filename)
obj =get(paste(m, i, sep=))
save(obj, file=pathname)
}
Then a more convenient solution is to use saveObject() and
loadObject() of R.utils. saveObject() does not save the name of the
object save.
The OP asked for this outcome :
I would like to save m as m1, m2, m3 ...,
to file /home/data/m1, /home/data/m2, home/data/m3, ...
If you want to save multiple objects, the wrap them up
in a list.
I agree that a list would makes sense if it were to be stored in one file
,
although it was not what requested.
That comment was not for the OP, but for saveObject()/loadObject() in
general.
But wouldn't that require assign()-ing a name before list()-wrapping?
Nope, the whole point of using saveObject()/loadObject() is to save
the objects/values without their names that you happens to choose in
the current session, and to avoid overwriting existing ones in your
next session. My example could also have been:
library(R.utils);
saveObject(list(a=1,b=LETTERS,c=Sys.time()), file=foo.Rbin);
y - loadObject(foo.Rbin);
z - loadObject(foo.Rbin);
stopifnot(identical(y,z));
If you really want to attach the elements of the saved list, do:
attachLocally(loadObject(foo.Rbin));
str(a)
num 1
str(b)
chr [1:26] A B C D E F G H I J ...
str(c)
POSIXct[1:1], format: 2009-11-01 21:30:41
I suppose we ought to mention that the use of assign to create a variable
is
a FAQ ... 7.21? Yep, I have now referred to it a sufficient number of
times
to refer to it by number.
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-
variable_003f
My personal take on assign() and get() is that if you find yourself
using them (at this level), there is a good chance there exists a
better solution that you should use instead.
My $.02
/H
--
David
loadObject() does not assign variable, but instead return
them. Example:
library(R.utils);
x - list(a=1,b=LETTERS,c=Sys.time());
saveObject(x, file=foo.Rbin);
y - loadObject(foo.Rbin);
stopifnot(identical(x,y));
So, for the original example, I'd recommend:
library(R.utils);
path - data;
mkdirs(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
saveObject(m, file=filename, path=path);
}
and loading the objects back as:
for (i in 1:10) {
filename - sprintf(m%02d.Rbin, i);
m - loadObject(filename, path=path);
print(m);
}
/Henrik
--
David.
/H
On Sun, Nov 1, 2009 at 6:53 PM, jeffc h...@andrew.cmu.edu wrote:
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to save m
as
m1,
m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
I tried a couple of methods on translating between object names and
strings
(below) but couldn't get it to work.
https://stat.ethz.ch/pipermail/r-help/2008-November/178965.html
http://tolstoy.newcastle.edu.au/R/help/04/08/2673.html
Any suggestions would be appreciated.
thanks
Hao
--
View this message in context:
http://old.nabble.com/save-an-object-by-dynamicly-created-name-tp26155437p26
155437.html
Sent from the R help
[R] save an object by dynamicly created name
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to save m as m1,
m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
I tried a couple of methods on translating between object names and strings
(below) but couldn't get it to work.
https://stat.ethz.ch/pipermail/r-help/2008-November/178965.html
http://tolstoy.newcastle.edu.au/R/help/04/08/2673.html
Any suggestions would be appreciated.
thanks
Hao
--
View this message in context:
http://old.nabble.com/save-an-object-by-dynamicly-created-name-tp26155437p26155437.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@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.
Re: [R] save an object by dynamicly created name
path - data;
dir.create(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
pathname - file.path(path, filename);
save(m, file=pathname);
}
/H
On Sun, Nov 1, 2009 at 6:53 PM, jeffc h...@andrew.cmu.edu wrote:
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to save m as m1,
m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
I tried a couple of methods on translating between object names and strings
(below) but couldn't get it to work.
https://stat.ethz.ch/pipermail/r-help/2008-November/178965.html
http://tolstoy.newcastle.edu.au/R/help/04/08/2673.html
Any suggestions would be appreciated.
thanks
Hao
--
View this message in context:
http://old.nabble.com/save-an-object-by-dynamicly-created-name-tp26155437p26155437.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@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.
__
R-help@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.
Re: [R] save an object by dynamicly created name
On Nov 1, 2009, at 10:16 PM, Henrik Bengtsson wrote:
path - data;
dir.create(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
pathname - file.path(path, filename);
save(m, file=pathname);
}
That would result in each of the ten files containing an object with
the same name == m. (Also on my system R data files have type
Rdta.) So I thought what was requested might have been a slight mod:
path - ~/;
dir.create(path);
for (i in 1:10) {
assign( paste(m, i, sep=), i:5)
filename - sprintf(m%02d.Rdta, i)
pathname - file.path(path, filename)
obj =get(paste(m, i, sep=))
save(obj, file=pathname)
}
--
David.
/H
On Sun, Nov 1, 2009 at 6:53 PM, jeffc h...@andrew.cmu.edu wrote:
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to save
m as m1,
m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
I tried a couple of methods on translating between object names and
strings
(below) but couldn't get it to work.
https://stat.ethz.ch/pipermail/r-help/2008-November/178965.html
http://tolstoy.newcastle.edu.au/R/help/04/08/2673.html
Any suggestions would be appreciated.
thanks
Hao
--
View this message in context:
http://old.nabble.com/save-an-object-by-dynamicly-created-name-tp26155437p26155437.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@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.
__
R-help@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.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
__
R-help@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.
Re: [R] save an object by dynamicly created name
On Sun, Nov 1, 2009 at 7:48 PM, David Winsemius dwinsem...@comcast.net wrote:
On Nov 1, 2009, at 10:16 PM, Henrik Bengtsson wrote:
path - data;
dir.create(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
pathname - file.path(path, filename);
save(m, file=pathname);
}
That would result in each of the ten files containing an object with the
same name == m. (Also on my system R data files have type Rdta.) So I
thought what was requested might have been a slight mod:
path - ~/;
dir.create(path);
for (i in 1:10) {
assign( paste(m, i, sep=), i:5)
filename - sprintf(m%02d.Rdta, i)
pathname - file.path(path, filename)
obj =get(paste(m, i, sep=))
save(obj, file=pathname)
}
Then a more convenient solution is to use saveObject() and
loadObject() of R.utils. saveObject() does not save the name of the
object save. If you want to save multiple objects, the wrap them up
in a list. loadObject() does not assign variable, but instead return
them. Example:
library(R.utils);
x - list(a=1,b=LETTERS,c=Sys.time());
saveObject(x, file=foo.Rbin);
y - loadObject(foo.Rbin);
stopifnot(identical(x,y));
So, for the original example, I'd recommend:
library(R.utils);
path - data;
mkdirs(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
saveObject(m, file=filename, path=path);
}
and loading the objects back as:
for (i in 1:10) {
filename - sprintf(m%02d.Rbin, i);
m - loadObject(filename, path=path);
print(m);
}
/Henrik
--
David.
/H
On Sun, Nov 1, 2009 at 6:53 PM, jeffc h...@andrew.cmu.edu wrote:
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to save m as
m1,
m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
I tried a couple of methods on translating between object names and
strings
(below) but couldn't get it to work.
https://stat.ethz.ch/pipermail/r-help/2008-November/178965.html
http://tolstoy.newcastle.edu.au/R/help/04/08/2673.html
Any suggestions would be appreciated.
thanks
Hao
--
View this message in context:
http://old.nabble.com/save-an-object-by-dynamicly-created-name-tp26155437p26155437.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@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.
__
R-help@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.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] save an object by dynamicly created name
On Nov 1, 2009, at 11:28 PM, Henrik Bengtsson wrote:
On Sun, Nov 1, 2009 at 7:48 PM, David Winsemius dwinsem...@comcast.net
wrote:
On Nov 1, 2009, at 10:16 PM, Henrik Bengtsson wrote:
path - data;
dir.create(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
pathname - file.path(path, filename);
save(m, file=pathname);
}
That would result in each of the ten files containing an object
with the
same name == m. (Also on my system R data files have type Rdta.)
So I
thought what was requested might have been a slight mod:
path - ~/;
dir.create(path);
for (i in 1:10) {
assign( paste(m, i, sep=), i:5)
filename - sprintf(m%02d.Rdta, i)
pathname - file.path(path, filename)
obj =get(paste(m, i, sep=))
save(obj, file=pathname)
}
Then a more convenient solution is to use saveObject() and
loadObject() of R.utils. saveObject() does not save the name of the
object save.
The OP asked for this outcome :
I would like to save m as m1, m2, m3 ...,
to file /home/data/m1, /home/data/m2, home/data/m3, ...
If you want to save multiple objects, the wrap them up
in a list.
I agree that a list would makes sense if it were to be stored in one
file , although it was not what requested. But wouldn't that require
assign()-ing a name before list()-wrapping?
I suppose we ought to mention that the use of assign to create a
variable is a FAQ ... 7.21? Yep, I have now referred to it a
sufficient number of times to refer to it by number.
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
--
David
loadObject() does not assign variable, but instead return
them. Example:
library(R.utils);
x - list(a=1,b=LETTERS,c=Sys.time());
saveObject(x, file=foo.Rbin);
y - loadObject(foo.Rbin);
stopifnot(identical(x,y));
So, for the original example, I'd recommend:
library(R.utils);
path - data;
mkdirs(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
saveObject(m, file=filename, path=path);
}
and loading the objects back as:
for (i in 1:10) {
filename - sprintf(m%02d.Rbin, i);
m - loadObject(filename, path=path);
print(m);
}
/Henrik
--
David.
/H
On Sun, Nov 1, 2009 at 6:53 PM, jeffc h...@andrew.cmu.edu wrote:
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to
save m as
m1,
m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
I tried a couple of methods on translating between object names and
strings
(below) but couldn't get it to work.
https://stat.ethz.ch/pipermail/r-help/2008-November/178965.html
http://tolstoy.newcastle.edu.au/R/help/04/08/2673.html
Any suggestions would be appreciated.
thanks
Hao
--
View this message in context:
http://old.nabble.com/save-an-object-by-dynamicly-created-name-tp26155437p26155437.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@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.
__
R-help@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.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
__
R-help@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.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
__
R-help@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.
Re: [R] save an object by dynamicly created name
On Sun, Nov 1, 2009 at 9:18 PM, David Winsemius dwinsem...@comcast.net wrote:
On Nov 1, 2009, at 11:28 PM, Henrik Bengtsson wrote:
On Sun, Nov 1, 2009 at 7:48 PM, David Winsemius dwinsem...@comcast.net
wrote:
On Nov 1, 2009, at 10:16 PM, Henrik Bengtsson wrote:
path - data;
dir.create(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
pathname - file.path(path, filename);
save(m, file=pathname);
}
That would result in each of the ten files containing an object with the
same name == m. (Also on my system R data files have type Rdta.) So I
thought what was requested might have been a slight mod:
path - ~/;
dir.create(path);
for (i in 1:10) {
assign( paste(m, i, sep=), i:5)
filename - sprintf(m%02d.Rdta, i)
pathname - file.path(path, filename)
obj =get(paste(m, i, sep=))
save(obj, file=pathname)
}
Then a more convenient solution is to use saveObject() and
loadObject() of R.utils. saveObject() does not save the name of the
object save.
The OP asked for this outcome :
I would like to save m as m1, m2, m3 ...,
to file /home/data/m1, /home/data/m2, home/data/m3, ...
If you want to save multiple objects, the wrap them up
in a list.
I agree that a list would makes sense if it were to be stored in one file ,
although it was not what requested.
That comment was not for the OP, but for saveObject()/loadObject() in general.
But wouldn't that require assign()-ing a name before list()-wrapping?
Nope, the whole point of using saveObject()/loadObject() is to save
the objects/values without their names that you happens to choose in
the current session, and to avoid overwriting existing ones in your
next session. My example could also have been:
library(R.utils);
saveObject(list(a=1,b=LETTERS,c=Sys.time()), file=foo.Rbin);
y - loadObject(foo.Rbin);
z - loadObject(foo.Rbin);
stopifnot(identical(y,z));
If you really want to attach the elements of the saved list, do:
attachLocally(loadObject(foo.Rbin));
str(a)
num 1
str(b)
chr [1:26] A B C D E F G H I J ...
str(c)
POSIXct[1:1], format: 2009-11-01 21:30:41
I suppose we ought to mention that the use of assign to create a variable is
a FAQ ... 7.21? Yep, I have now referred to it a sufficient number of times
to refer to it by number.
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
My personal take on assign() and get() is that if you find yourself
using them (at this level), there is a good chance there exists a
better solution that you should use instead.
My $.02
/H
--
David
loadObject() does not assign variable, but instead return
them. Example:
library(R.utils);
x - list(a=1,b=LETTERS,c=Sys.time());
saveObject(x, file=foo.Rbin);
y - loadObject(foo.Rbin);
stopifnot(identical(x,y));
So, for the original example, I'd recommend:
library(R.utils);
path - data;
mkdirs(path);
for (i in 1:10) {
m - i:5;
filename - sprintf(m%02d.Rbin, i);
saveObject(m, file=filename, path=path);
}
and loading the objects back as:
for (i in 1:10) {
filename - sprintf(m%02d.Rbin, i);
m - loadObject(filename, path=path);
print(m);
}
/Henrik
--
David.
/H
On Sun, Nov 1, 2009 at 6:53 PM, jeffc h...@andrew.cmu.edu wrote:
Hi,
I would like to save a few dynamically created objects to disk. The
following is the basic flow of the code segment
for(i = 1:10) {
m = i:5
save(m, file = ...) ## ???
}
To distinguish different objects to be saved, I would like to save m as
m1,
m2, m3 ..., to file /home/data/m1, /home/data/m2, home/data/m3, ...
I tried a couple of methods on translating between object names and
strings
(below) but couldn't get it to work.
https://stat.ethz.ch/pipermail/r-help/2008-November/178965.html
http://tolstoy.newcastle.edu.au/R/help/04/08/2673.html
Any suggestions would be appreciated.
thanks
Hao
--
View this message in context:
http://old.nabble.com/save-an-object-by-dynamicly-created-name-tp26155437p26155437.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@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.
__
R-help@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.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
__
R-help@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.
David Winsemius, MD
