[R] How to remove the double or single quote from a string (unquote?)?

Allan Engelhardt allane at cybaea.com
Mon Apr 18 18:54:51 CEST 2011

This should be a FAQ: you are confusing the value with its printed 
representation.  Try

print(paste("V", 3:8, sep=""), quote=FALSE)

to see that there are no quotes, and you may want to read up on 
help("as.formula", package="stats") which has the examples you are 
searching for.


On 18/04/11 17:38, JingJiang Yan wrote:
> Is there a function to get a string without a pair of quotes around it?
> I have several expressions like:
> glm(V12 ~ V3, family=binomial, data=df1)
> glm(V12 ~ V4, family=binomial, data=df1)
> ...
> glm(V12 ~ V8, family=binomial, data=df1)
> As you can see, the only differences among them are V3 ... V8.
> Because sometimes several of these expressions are performed many times,
> I want to use a variable "i" to change the V3 ... V8. I did this with:
> > i <- 3:8
> > glm(V12 ~ paste("V", i, sep=""), family=binomial, data=df1)
> However, it seems the paste always returns a variable name with a pair 
> of quotes, which were wrong in such condition.
> I only find a function "sQuote" to add quotes to a string, and it 
> looks I am looking for an opposite function of it.
> Any advice will be appreciated.
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