On 30/09/2009, at 10:25 AM, Duncan Murdoch wrote:
On 29/09/2009 4:54 PM, Rolf Turner wrote:
On 30/09/2009, at 9:32 AM, milton ruser wrote:
x=runif(12)
y=runif(12)
w=runif(12)
mydf<-data.frame(cbind(x,y,w))
head(mydf)
mydf<-subset(mydf, select=c(-x,-w))
head(mydf)
But this doesn't work if NAME1 and NAME2 are ***names***,
as the terminology would apply. And that is precisely the
situation in which one would wish to apply this sort of
technique.
I'm not completely sure what you're getting at here, but I think
milton
is right in this example. (The original one was missing the "c".)
milton is right if you explicitly type in the names of the
columns to be deleted. But it doesn't work if you store
the names of the columns as character strings. That's what
you would have to do when writing code to handle complex
situations where you didn't know that column names in advance.
And if you're not writing code, well why not just do something
simple like mydf[,2] ???
subset() is weird, it does very strange stuff in the select argument.
Truer words were never spoken/written.
cheers,
Rolf
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