[R] Difference subsetting (dataset$variable vs. dataset["variable"]

[G.Maubach at weinwolf.de]

Hi All,

I thought dataset$variable is the same as dataset["variable"]. I tried the 
following:

> str(ZWW_Kunden$Branche)
 chr [1:49673] "231" "151" "151" "231" "231" "111" "231" "111" "231" "231" 
"151" "111" ...
> str(ZWW_Kunden["Branche"])
'data.frame':            49673 obs. of  1 variable:
 $ Branche: chr  "231" "151" "151" "231" ...

and get different results: "chr {1:49673]" vs. "data.frame". First one is 
a simple vector, second one is a data.frame.

This has consequences when subsetting a dataset and filter cases:

> ZWW_Kunden["Branche"] %in% c("315", "316", "317")
[1] FALSE

> head(ZWW_Kunden$Branche %in% c("315", "316", "317")) # head() only to 
shorten output
[1] FALSE FALSE FALSE FALSE FALSE FALSE

I have thought dataset$variable is the same as dataset["variable"] but 
actually it's not.

Can you explain what the difference is?

Kind regards

Georg