[R] Problems using save to store NAMED R objects

[Julio Sergio Santana]

Thanks Duncan,

I just saw another, but similar, solution for this in
http://stackoverflow.com/questions/11084395/save-object-using-variable-with-object-name
,
and it is:

   : save(list=nn, file="f.RData")

Thanks again,

  -Sergio.

On Thu, Nov 12, 2015 at 8:57 PM, Duncan Murdoch <murdoch.duncan at gmail.com>
wrote:

> On 12/11/2015 6:41 PM, Julio Sergio Santana wrote:
>
>> I have to store (in a file) an R object that was created with is name as
>> a string of characters, as follows:
>>
>>     : nn <- "xxx"
>>     : assign(nn, 5)
>>     : xxx
>>     [1] 5
>>
>> I don't want to store the object nn but the object xxx. I tried the
>> following two expressions but none of them worked:
>>
>>     : save(get(nn), file="f.RData")
>>     Error in save(get(nn), file = "f.RData") : object ‘get(nn)’ not found
>>
>>     : save(eval(nn), file="f.RData")
>>     Error in save(eval(nn), file = "f.RData") : object ‘eval(nn)’ not
>> found
>>
>> I know that both save(xxx, ..), and save("xxx", ..) work, but the fact
>> is that the string is going to be provided by an user:
>>
>>     : nn <- readline("Your variable->")
>>
>> and
>>     : save(nn, file="f.RData")
>> stores the objet nn not xxx
>>
>> Do you have any comments on this?
>>
>
> I believe
>
> do.call(save, list(as.name(nn), file = "f.RData"))
>
> should do what you want.  There are probably other ways, maybe simpler
> ones.
>
> If you're interested, the theory here is that do.call() constructs a call
> to the first argument, with arguments found by evaluating the second
> argument.
>
> Duncan Murdoch
>



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