[R] Save and load workspace in R: strange error.

[Tony Plate]

Sounds like you are having permissions problems.  And as you're using a 
mix of Unix and WinXP, you might be suffering from some strange 
permissions settings.  WinXP allows a very rich set of permissions which 
for many exotic combinations have no corresponding mapping to the much 
simpler 9-octet Unix permissions space -- so the limited view provided 
by the Unix permission string -rw-r--r-- may not really reflect what you 
can do with the file.  On my own system, where I use WinXP and cygwin, 
I've sometimes seem very strange Windows permission sets that look OK in 
cygwin, but essentially disable use of a particular file.  I generally 
fix this by resetting ownership and all permissions using Windows 
dialogs.  It sounds like you need to get your sysadmins to help you sort 
this problem out.

-- Tony Plate

Hongxiao Zhu wrote:
> Tony,
>
> Thanks for return. Actually, the data object 'junk4.RData' was created 
> but have size 0. It seems no data was saved. But the real data that I 
> want to load have data in it, which I can't load use my own user 
> account. But if using other people's user account under the same 
> system, it can be loaded.
>
> All the files has the following property if I use ls -l:
> -rw-r--r--
>
> The OS I used is windows xp. But I use SSH to connect to the unix server.
>
> I have been using this server for a long time, this error happened 
> since some day and from then on, I can never load/save workspace.
>
> Hong
>
> **********************************************
>  *  Hongxiao Zhu                              *
>  *  Department of Statistics, Rice Univeristy *
>  *  Office: DH 3136, Phone: 713-348-2839      *
>  *  http://www.stat.rice.edu/~hxzhu/          *
>  **********************************************
>
> On Wed, 3 Oct 2007, Tony Plate wrote:
>
>> Did you check whether 'junk4.RData' was created and what its length 
>> was - maybe an empty file is being created.  Is there some sort of 
>> quota or permissions problem?  My suggestion would be to look at the 
>> size and permissions on the directory and the file.  If you need more 
>> help, I would suggest posting more details back to the list, e.g., 
>> what OS you are using, and a directory listing that shows file sizes 
>> and permissions (i.e., as you get with 'ls -l' on Unix systems.)
>>
>> -- Tony Plate
>>
>> Hongxiao Zhu wrote:
>>> Hi,
>>>
>>> I tried to load a .RData object on unix system using R, it gives error:
>>>
>>> Error: restore file may be empty -- no data loaded
>>> In addition: Warning message:
>>> file 'junk3.RData' has magic number ''
>>>     Use of save versions prior to 2 is deprecated
>>>
>>> This happens only for using MY user account for the Unix system. I 
>>> tried to use a friends's user account to load the same data object, 
>>> it is
>>> fine. And it never happened to me before until sometime last week.
>>> And This error happens even when I generate a simple random number
>>> from my user account and save it, and load it again.(So obviously it 
>>> is not a R version mismatch problem). Does anybody know what happened?
>>>
>>> Here is an example what happened:
>>>
>>>> x=rnorm(100)
>>>> save.image('junk4.RData')
>>>> load('junk4.RData')
>>> Error: restore file may be empty -- no data loaded
>>> In addition: Warning message:
>>> file 'junk4.RData' has magic number ''
>>>     Use of save versions prior to 2 is deprecated
>>>
>>> Thanks for any suggestion.
>>>
>>> Hongxiao
>>>
>>>
>>> **********************************************
>>>   *  Hongxiao Zhu                              *
>>>   *  Department of Statistics, Rice Univeristy *
>>>   *  Office: DH 3136, Phone: 713-348-2839      *
>>>   *  http://www.stat.rice.edu/~hxzhu/          *
>>>
>>> ______________________________________________
>>> R-help at 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.
>>>
>>
>>
>> !DSPAM:4703b16f15261021468!
>>
>