[R] Syntax Question

[Jason Turner]

> I have a large data structure that looks like:
>
>> strsplit(st,",")[14395]
>  [1] "KGEG"
>  [2] "SA => KGEG"
>  [3] "72785"
>  [4] "47.62139"
>  [5] "-117.52778"
>  [6] "723"
>  [7] "WA"
>  [8] "US"
>  [9] "2"
> [10] "SPOKANE SPOKANE INTERNATIONAL AIRPORT"
> [11] "1"
>
>
> I'd like to be able to retrieve, for example, the latitude
> as.numeric(strsplit(st,",")[[14395]][4]) and longitude
> as.numeric(strsplit(st,",")[[14395]][5]) for the entry in the structure
> where strsplit(st,",")[[14395]][5])=="KGEG" by specifying various station
> IDs.  That is, if I had a simpler structure I could formulate a
> logical index which would have something along the lines of
> as.numeric(st[st[1]=="KSEA"][4]) and it would return 47.62139.

Too confusing for me.  I'd just convert it to a data frame.

## UNTESTED!!!
stm <- t(matrix(st,nrow=11))
stdf <- data.frame(stm)
stdf[stdf[,1]=="KSEA",4]

## <OPTIONAL> - just makes life easier later
## do some "as.numeric" calls to various columns.
stdf[,x] <- as.numeric(stdf[,x])
## add some names
names(stdf) <- c("blah",...)
## </OPTIONAL>

Cheers

Jason