[R] Why can't I access this type?

[John Kane]

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.

Try this. It's ugly and I have no idea why I had to do a cbind() but it seems to work. Personally I find subset easier to read than the indexing approach.

state  <-  rownames(state.x77)
all.states <- as.data.frame(state.x77)
all.states  <-  cbind(state, all.states) ### ?????

coldstates  <-   subset(all.states, all.states$Frost > 50, 
                        select = c("state","Frost") )


John Kane
Kingston ON Canada


> -----Original Message-----
> From: yoursurrogategod at gmail.com
> Sent: Sun, 22 Mar 2015 10:39:03 -0400
> To: r-help at r-project.org
> Subject: [R] Why can't I access this type?
> 
> Hi, I'm just learning my way around R.  I got a bunch of states and would
> like to access to get all of the ones where it's cold.  But when I do the
> following, I will get the following error:
> 
>> all.states <- as.data.frame(state.x77)
>> cold.states <- all.states[all.states$Frost > 150, c("Name", "Frost")]
> Error in `[.data.frame`(all.states, all.states$Frost > 150, c("Name",  :
>   undefined columns selected
> 
> I don't get it.  When I look at all.states, this is what I see:
> 
>> str(all.states)
> 'data.frame':   50 obs. of  8 variables:
>  $ Population: num  3615 365 2212 2110 21198 ...
>  $ Income    : num  3624 6315 4530 3378 5114 ...
>  $ Illiteracy: num  2.1 1.5 1.8 1.9 1.1 0.7 1.1 0.9 1.3 2 ...
>  $ Life Exp  : num  69 69.3 70.5 70.7 71.7 ...
>  $ Murder    : num  15.1 11.3 7.8 10.1 10.3 6.8 3.1 6.2 10.7 13.9 ...
>  $ HS Grad   : num  41.3 66.7 58.1 39.9 62.6 63.9 56 54.6 52.6 40.6 ...
>  $ Frost     : num  20 152 15 65 20 166 139 103 11 60 ...
>  $ Area      : num  50708 566432 113417 51945 156361 ...
> 
> What am I messing up?
> 
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> 
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