[R] "get" problem

[Douglas Bates]

On Wed, Feb 24, 2010 at 3:56 PM, Duncan Murdoch <murdoch at stats.uwo.ca> wrote:
> On 24/02/2010 4:31 PM, Georg Ehret wrote:
>>
>> Dear R communtiy,
>>   I do not understand why this does not work...:
>>
>> > betaS$SBP
>> [1]  0.03274 -0.04216 -0.08986 -0.45980  0.60320 -0.63070 -0.05682
>>  0.20130
>> > t<-c("betaS$SBP")
>> > t
>> [1] "betaS$SBP"
>> > get(t)
>> Error in get(t) : object 'betaS$SBP' not found
>>
>
> The problem is that betaS$SBP is an expression that extracts a component of
> the betaS object, it's not the name of an object.  get() only gets single
> objects, it doesn't evaluate expressions.  You need something like
>
> eval(parse(text=t))
>
> to get what you want.

But if you have read

fortune("rethink")

you may approach the problem differently.

P.S. I agree with Thomas, which may seem strange to anyone who has
read the nlme sources. :-)

>> [I am trying to use the variable "t" in a loop to call many different
>> objects, but the pasting together did not work and this simple example
>> does
>> not neither...]
>>
>> Thank you and best regards, Georg.
>> *******************
>> Georg Ehret
>> JHU
>> Baltimore
>>
>>        [[alternative HTML version deleted]]
>>
>> ______________________________________________
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>> http://www.R-project.org/posting-guide.html
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>>
>
> ______________________________________________
> 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.
>