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tomm
2009 Dec 03
1
S4 and head() problems
...eric("head")})
setMethod("head",signature="mdm",function(x,n=6,...){
mdm(head(x at xold,n=n,...) , types=factor(head(x at types,n=n,...)))
} )
If the above lines are part of the package source, and I install the package
then sometimes I get errors like
> head(toy_mm())
Error in function (classes, fdef, mtable) :
unable to find an inherited method for function "head", for signature
"matrix"
>
and sometimes it works as desired.
Why should head() not be able to take the first few lines of a matrix?
It seems to be "forgetting&quo...