>>>>> "Fernando" == Fernando Saldanha <[EMAIL PROTECTED]>
>>>>> on Thu, 28 Apr 2005 02:01:13 -0400 writes:
Fernando> Thanks, Prasad. That works. Another alternative is:
Fernando> eval(parse(text = paste('a', '[1] <- 0', sep = '')))
yes, unfortunately that's an alternative that people seem to use
"on and on"...
*NO*, that's really not something you should use as an
-- alternative to assign()!!
I think Peter Dalgaard has a ``paper - yet to be written'' on
the subject that if you use
eval(parse(text = .....))
you should think twice and try doing it differently.
I'm too busy to go into details but didn't want to let this
"pass" ...
Martin
Fernando> On 4/27/05, Chalasani, Prasad <[EMAIL PROTECTED]> wrote:
>> how about
>>
>> assign( 'a', { z <- get('a'); z[1] <- 0; z } )
>>
>>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of Fernando Saldanha
>> Sent: Wednesday, April 27, 2005 3:22 PM
>> To: Submissions to R help
>> Subject: [R] assign to an element of a vector
>>
>> I am trying to find a way to assign values to elements of a vector that
will
>> be defined by a user. So I don't have the name of the vector and cannot
hard
>> code the assignment in advance. In the example below I have to get() the
>> vector using its name. When I try to assign to an element I get an error:
>>
>> > a <- c(1,2,3)
>> > get('a')[1] <- 0
>> Error: Target of assignment expands to non-language object
>>
>> Any suggestions?
>>
>> FS
>>
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>>
Fernando> ______________________________________________
Fernando> [email protected] mailing list
Fernando> https://stat.ethz.ch/mailman/listinfo/r-help
Fernando> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
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