[R] How to reach the column names in a huge .RData file without loading it

[Boris Steipe]

However: if you need to repeat the process, as you wrote, you could store the column names in a separate object for future access after your first read.

B.


On Mar 16, 2016, at 12:59 PM, Lida Zeighami <lid.zigh at gmail.com> wrote:

> Thank you Bert and Frederic.
> 
> On Wed, Mar 16, 2016 at 11:52 AM, Bert Gunter <bgunter.4567 at gmail.com>
> wrote:
> 
>> Is it really a .Rdata file? If so, the answer is no, AFAIK, since
>> .Rdata files are serialized (binary) versions of e.g. worksheets that
>> can contain many different data objects. "colnames" has no meaning in
>> this context.
>> 
>> Corrections welcome if I have it wrong!
>> 
>> Cheers,
>> Bert
>> Bert Gunter
>> 
>> "The trouble with having an open mind is that people keep coming along
>> and sticking things into it."
>> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>> 
>> 
>> On Wed, Mar 16, 2016 at 8:59 AM, Lida Zeighami <lid.zigh at gmail.com> wrote:
>>> Hi,
>>> I have a huge .RData file and I need just to get the colnames of it. so
>> is
>>> there any way to reach the column names without loading or reading the
>>> whole file?
>>> Since the file is so big and I need to repeat this process several times,
>>> so it takes so long to load the file first and then take the colnames!
>>> 
>>> Thanks
>>> 
>>>        [[alternative HTML version deleted]]
>>> 
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> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.