Re: [R] load object
Weiwei Shi writes:
Hi,
I happen to re-write my codes to save memory and my
approach is write my obj into file first and later I
load it.
However, it seems like:
load(filename) can load the object but the function
returns the name of the object instead of the
reference to it. For example, I have an object called
r0.prune, which is saved by
save(r0.prune, file='r0.prune')
and later, I want to load it by using:
load('r0.prune')
but I need to put the reference to the object r0.prune
into a var or a list. I tried:
t-load('r0.prune'),
and class(t) gave me a char, which means t stores the
name of obj instead of the obj itself.
As load() when used interactively will load it into the Global
workspace by default, you can just use get() on it.
r0.prune - 1:10
save(r0.prune,file='dados.dat')
rm(r0.prune)
t - get(load('dados.dat'))
t
--
Fernando Henrique Ferraz P. da Rosa
http://www.ime.usp.br/~feferraz
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[R] load object
Hi,
I happen to re-write my codes to save memory and my
approach is write my obj into file first and later I
load it.
However, it seems like:
load(filename) can load the object but the function
returns the name of the object instead of the
reference to it. For example, I have an object called
r0.prune, which is saved by
save(r0.prune, file='r0.prune')
and later, I want to load it by using:
load('r0.prune')
but I need to put the reference to the object r0.prune
into a var or a list. I tried:
t-load('r0.prune'),
and class(t) gave me a char, which means t stores the
name of obj instead of the obj itself.
Sorry for the dumb question but please help...
Weiwei
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Re: [R] load object
Weiwei Shi wrote:
Hi,
I happen to re-write my codes to save memory and my
approach is write my obj into file first and later I
load it.
However, it seems like:
load(filename) can load the object but the function
returns the name of the object instead of the
reference to it. For example, I have an object called
r0.prune, which is saved by
save(r0.prune, file='r0.prune')
and later, I want to load it by using:
load('r0.prune')
but I need to put the reference to the object r0.prune
into a var or a list. I tried:
t-load('r0.prune'),
and class(t) gave me a char, which means t stores the
name of obj instead of the obj itself.
Sorry for the dumb question but please help...
Weiwei
I was going to suggest that you read the help page for load but when I
looked at it myself I found that it was not obvious what the effect of
calling load at the prompt is. The help page is accurate but it is a
bit confusing if you don't know what the default environment is.
Anyway, when called from the prompt, load has the side effect of loading
the object into the global environment. Try
save(r0.prune, file='r0.prune')
rm(r0.prune)
find(r0.prune) # should produce an error message
load('r0.prune')
find(r0.prune) # should show the object in the global environment
str(r0.prune) # etc.
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Re: [R] load object
On Thu, 2005-01-13 at 11:00 -0800, Weiwei Shi wrote:
Hi,
I happen to re-write my codes to save memory and my
approach is write my obj into file first and later I
load it.
However, it seems like:
load(filename) can load the object but the function
returns the name of the object instead of the
reference to it. For example, I have an object called
r0.prune, which is saved by
save(r0.prune, file='r0.prune')
and later, I want to load it by using:
load('r0.prune')
but I need to put the reference to the object r0.prune
into a var or a list. I tried:
t-load('r0.prune'),
and class(t) gave me a char, which means t stores the
name of obj instead of the obj itself.
Sorry for the dumb question but please help...
Does the following help?
# create the object
r0.prune - 1:10
# display the object
r0.prune
[1] 1 2 3 4 5 6 7 8 9 10
# save the object
save(r0.prune, file='r0.prune')
# show the object is present
ls()
[1] r0.prune
# remove the object
rm(r0.prune)
# show that the object is gone
ls()
character(0)
# reload the object into the current workspace
load('r0.prune')
# show the object is back
ls()
[1] r0.prune
# display the object
r0.prune
[1] 1 2 3 4 5 6 7 8 9 10
# now remove the object again
rm(r0.prune)
# It's gone
ls()
character(0)
# now use:
t - load('r0.prune')
# See what is now present
ls()
[1] r0.prune t
t
[1] r0.prune
r0.prune
[1] 1 2 3 4 5 6 7 8 9 10
't' returns the _name(s)_ of the loaded object(s) as a character vector,
just as documented.
The object itself is available in the workspace. You can use 'r0.prune'
just as per normal routine:
mean(r0.prune)
[1] 5.5
MyList - list(r0.prune)
MyList
[[1]]
[1] 1 2 3 4 5 6 7 8 9 10
HTH,
Marc Schwartz
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Re: [R] load object
From: Douglas Bates [EMAIL PROTECTED] Fri Jan 14 08:35:33 2005
Weiwei Shi wrote:
Hi,
I happen to re-write my codes to save memory and my
approach is write my obj into file first and later I
load it.
However, it seems like:
load(filename) can load the object but the function
returns the name of the object instead of the
reference to it. For example, I have an object called
r0.prune, which is saved by
save(r0.prune, file='r0.prune')
and later, I want to load it by using:
load('r0.prune')
but I need to put the reference to the object r0.prune
into a var or a list. I tried:
t-load('r0.prune'),
and class(t) gave me a char, which means t stores the
name of obj instead of the obj itself.
Sorry for the dumb question but please help...
Weiwei
I was going to suggest that you read the help page for load but when I
looked at it myself I found that it was not obvious what the effect of
calling load at the prompt is. The help page is accurate but it is a
bit confusing if you don't know what the default environment is.
Anyway, when called from the prompt, load has the side effect of loading
the object into the global environment. Try
Well ?load does say:
Value:
A character vector of the names of objects created, invisibly.
Note the plurals. The point is that the file being loaded may contain
the definition of more than one R object. You can say:
tt - get(load('r0.prune')) # t is not a good example name to use
which will do what you want, but:
1) load() has a side-effect of also creating r0.prune (in your case)
2) if the file 'r0.prune' contains more than one object, only the first
is assigned to tt (but all of them are loaded into memory with their
original names).
Hope this helps,
Ray Brownrigg
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Re: [R] load object
Hi,
thanks for everyone.
I think function get is what I wanted.
?get returns like:
Description:
Search for an R object with a given name and return
it.
Actually I need such reference to handle this obj.
Sorry if there is a misleading description in my
previous email.
weiwei
--- Ray Brownrigg [EMAIL PROTECTED] wrote:
From: Douglas Bates [EMAIL PROTECTED] Fri Jan 14
08:35:33 2005
Weiwei Shi wrote:
Hi,
I happen to re-write my codes to save memory and
my
approach is write my obj into file first and
later I
load it.
However, it seems like:
load(filename) can load the object but the
function
returns the name of the object instead of the
reference to it. For example, I have an object
called
r0.prune, which is saved by
save(r0.prune, file='r0.prune')
and later, I want to load it by using:
load('r0.prune')
but I need to put the reference to the object
r0.prune
into a var or a list. I tried:
t-load('r0.prune'),
and class(t) gave me a char, which means t
stores the
name of obj instead of the obj itself.
Sorry for the dumb question but please help...
Weiwei
I was going to suggest that you read the help page
for load but when I
looked at it myself I found that it was not
obvious what the effect of
calling load at the prompt is. The help page is
accurate but it is a
bit confusing if you don't know what the default
environment is.
Anyway, when called from the prompt, load has the
side effect of loading
the object into the global environment. Try
Well ?load does say:
Value:
A character vector of the names of objects
created, invisibly.
Note the plurals. The point is that the file being
loaded may contain
the definition of more than one R object. You can
say:
tt - get(load('r0.prune')) # t is not a good
example name to use
which will do what you want, but:
1) load() has a side-effect of also creating
r0.prune (in your case)
2) if the file 'r0.prune' contains more than one
object, only the first
is assigned to tt (but all of them are loaded into
memory with their
original names).
Hope this helps,
Ray Brownrigg
__
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