On Thu, 26-Mar-2015 at 04:58PM -0400, yoursurrogate...@gmail.com wrote:
[...]
|> I agree with you on the indexing approach. But even after using
|> within, I still get the same error. >
You leave us to guess just what you tried, but if you did this:
> all.states <- within(as.data.frame(state.x77), state <- rownames(state.x77))
and then again did this:
> cold.states <- all.states[all.states$Frost > 150, c("Name", "Frost")]
of course it will give the same error, because as you haven't
addressed the problem as you've been told
On Sun, 22-Mar-2015 at 08:06AM -0800, John Kane wrote:
|> Well, first off, you have no variable called "Name". You have lost
|> the state names as they are rownames in the matrix state.x77 and
|> not a variable.
If you did this:
> all.states <- within(as.data.frame(state.x77), Name <- rownames(state.x77))
instead of
> all.states <- within(as.data.frame(state.x77), state <- rownames(state.x77))
then this would worka;
> cold.states <- all.states[all.states$Frost > 150, c("Name", "Frost")]
Modify the above to match where my guess at what you tried is in error.
HTH
--
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
___ Patrick Connolly
{~._.~} Great minds discuss ideas
_( Y )_ Average minds discuss events
(:_~*~_:) Small minds discuss people
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