[R] Updating an object

[Ben Bolker]

Uwe Ligges-3 wrote:
> 
> 
> 
> megh wrote:
>> Let say, I have an arbitrary vector :
>> 
>> i=1
>> assign(paste("dat",i,sep=""), rnorm(5))
>> 
>> Now I want to update that "dat1" vector by ommiting last 2 elements i.e.
>> 
>> dat1 = dat1[c(1:3)]
>> 
>> However here my problem is, as "dat1" depends on another variable "i", I
>> cannot use above syntax directly. I want to automate above syntax such
>> that
>> I can run this for any "i". Is there any way?
> 
> 
> Yes, but actually you want a list "dat" that contains vectors at 
> positions i.
> 
> Uwe Ligges
> 
> 

To expand on this slightly: you can use get() and assign() to retrieve
and assign, respectively, values from "constructed" variable names,
but it is generally much easier to do this with a list: this is a version
of R FAQ 7.21: 
http://cran.r-project.org/doc/FAQ/R-FAQ.html#How-can-I-turn-a-string-into-a-variable_003f
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