[R] variable format

[Gabor Grothendieck]

A matrix is for situations where every element is of the same class
but your columns have different classes so use a data frame:

DF <- data.frame(a = 11:15, b = letters[1:5], stringsAsFactors = FALSE)
subset(DF, a %in% 11:13)
subset(DF, a %in% c(0, 11:13)) # same

Suggest you review the Introduction to R manual and look at ?data.frame,
?subset and ?"%in%"

On 9/4/07, Cory Nissen <cnissen at akoyainc.com> wrote:
> Okay, I want to do something similar to SAS proc format.
>
> I usually do this...
>
> a <- NULL
> a$divisionOld <- c(1,2,3,4,5)
> divisionTable <- matrix(c(1, "New England",
>                          2, "Middle Atlantic",
>                          3, "East North Central",
>                          4, "West North Central",
>                          5, "South Atlantic"),
>                        ncol=2, byrow=T)
> a$divisionNew[match(a$divisionOld, divisionTable[,1])] <- divisionTable[,2]
>
> But how do I handle the case where...
> a$divisionOld <- c(0,1,2,3,4,5)   #no format available for 0, this throws an error.
> OR
> divisionTable <- matrix(c(1, "New England",
>                          2, "Middle Atlantic",
>                          3, "East North Central",
>                          4, "West North Central",
>                          5, "South Atlantic",
>                          6, "East South Central",
>                          7, "West South Central",
>                          8, "Mountain",
>                          9, "Pacific"),
>                        ncol=2, byrow=T)
> There are extra formats available... this throws a warning.
>
> Thanks
>
> Cory
>
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