[R] outer function and boolean operators

[Uwe Ligges]

Jarrod Hadfield wrote:

> Hi,
> 
> Could anyone tell me the name (if there is one) of the class of 
> matrices (z) formed by:
> 
> a)  z<-outer(x,y, "==")
> 
> and
> 
> b) z<-outer(x,y, "!=")

Yes, it is "matrix":

class(outer(x,y, "=="))
[1] "matrix"

in this case of "logical" values:

 > mode(outer(x,y, "=="))
[1] "logical"


Uwe Ligges


> Thanks in advance,
> 
> Jarrod.
> 
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