[R] why is 0 not an integer?

[Erik Iverson]

First, this has nothing to do with "0".  Assigning 1000 to an element of v would also have this effect.  Two, the first element of a vector is indexed by "1", not "0".  While what you wrote isn't a syntax error (v[0] <- 0), it may be not doing what you think, but I don't know. 

Finally, the answer to your question.  Try typing class(0)  to see that it is in fact numeric.  

So you may want v[1] <- as.integer(0) to get what you are expecting. 

HTH. 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Steve Jaffe
Sent: Wednesday, August 05, 2009 3:16 PM
To: r-help at r-project.org
Subject: [R] why is 0 not an integer?


Why when I assign 0 to an element of an integer vector does the type change
to numeric?
Here is a particularly perplexing example:
> v <- 0:10
> v
 [1]  0  1  2  3  4  5  6  7  8  9 10
> class(v)
[1] "integer"
> v[0] <- 0
> class(v)
[1] "numeric"  #!!
> 

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