On Jul 29, 2013, at 08:27 , Jeff Newmiller wrote:
> You seem confused.
Not particularly, but he needs to be aware of _which_ shell R is executing in
system() calls. These things work for me:
> system("foo=(bar baz); echo ${foo[1]}")
baz
Dario's issue is suggested by his error message
>>> system("names=(X Y)")
>> sh: Syntax error: "(" unexpected
The shell is (Bourne) "sh", not "bash", so bash extension won't work.
This is highly system dependent: On OSX Snow Leopard, e.g., /bin/sh really is
GNU bash, which is why it works for me. Others have the more sane setup where
/bin/sh really is Bourne sh.
Next question is of course how to ensure that bash gets used. I must admit that
I have long forgotten...
-Peter D.
> You are programming in R, and asking questions about bash on an R mailing
> list. You seem to need to learn the difference between environment variables
> and bash variables and how processes acquire and transfer environment
> variables, which is really an operating system concept and off topic here.
> Once you do understand this difference, you might be interested in reading
> the R help file on Sys.setenv().
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>
> Dario Strbenac <dstr7...@uni.sydney.edu.au> wrote:
>> Hello,
>>
>> It is difficult searching for previous posts about this since the
>> keywords are short and ambiguous, so I hope this is not a duplicate
>> question.
>>
>> I can easily declare an array on the command line.
>>
>> $ names=(X Y)
>> $ echo ${names[0]}
>> X
>>
>> I am unable to do the same from within R.
>>
>>> system("names=(X Y)")
>> sh: Syntax error: "(" unexpected
>>
>> Reading the documentation for the system function, it appears to only
>> be relevant for executing commands. What can I do instead to declare a
>> BASH array ? Thanks.
>>
>> --------------------------------------
>> Dario Strbenac
>> PhD Student
>> University of Sydney
>> Camperdown NSW 2050
>> Australia
>>
>> ______________________________________________
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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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--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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