[R] class<- vs. as()

[Spencer Graves]

	  What do you want?  Consider the following:

 > v <- matrix(1:9, 3)
 > class(v[1,1])
[1] "integer"
 > class(as.vector(v))
[1] "integer"
 > v2 <- v
 > dim(v2) <- NULL
 > class(v2)
[1] "integer"

	  spencer graves

stefan.albrecht at allianz.com wrote:

> 
> 
> 
> Dear all,
> 
> I would appreciate a lot, if someone could explain to me in a simple
> way, why the assignment class<- is not always working and one has to
> take as() like in the example below.
> 
> 
>>(v <- matrix(1:9, 3))
> 
>      [,1] [,2] [,3]
> [1,]    1    4    7
> [2,]    2    5    8
> [3,]    3    6    9
> 
>>class(v)
> 
> [1] "matrix"
> 
> 
>>class(v) <- "integer"
>>class(v)
> 
> [1] "matrix"
> 
>>v
> 
>      [,1] [,2] [,3]
> [1,]    1    4    7
> [2,]    2    5    8
> [3,]    3    6    9
> 
> 
>>(vi <- as(v, "integer"))
> 
> [1] 1 2 3 4 5 6 7 8 9
> 
>>class(vi)
> 
> [1] "integer"
> 
> 
> With many thanks,
> 
> Stefan
> 	[[alternative HTML version deleted]]
> 
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Spencer Graves, PhD
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