Arne Henningsen wrote:
Hi,
I am using R 1.9.1 on on i686 PC with SuSE Linux 9.0.
I have a data.frame, e.g.:
myData <- data.frame( var1 = c( 1:4 ), var2 = c (5:8 ) )
If I add a new column by
myData$var3 <- myData[ , "var1" ] + myData[ , "var2" ]
everything is fine, but if I omit the commas:
myData$var4 <- myData[ "var1" ] + myData[ "var2" ]
This bug is the user ... ;-)
Type: str(myData) `data.frame': 4 obs. of 3 variables: $ var1: int 1 2 3 4 $ var2: int 5 6 7 8 $ var4:`data.frame': 4 obs. of 1 variable: ..$ var1: int 6 8 10 12
Aha! You have created a data.frame consisting of one column! What you mean really mean is
myData$var5 <- myData[[ "var1" ]] + myData[[ "var2" ]]
Uwe Ligges
the name shown above the 4th column is not "var4":
myData
var1 var2 var3 var1 1 1 5 6 6 2 2 6 8 8 3 3 7 10 10 4 4 8 12 12
but names() and colnames() return the expected name:
names( myData )
[1] "var1" "var2" "var3" "var4"
colnames( myData )
[1] "var1" "var2" "var3" "var4"
And it is even worse: I am not able to change the name shown above the 4th column:
names( myData )[ 4 ] <- "var5" myData
var1 var2 var3 var1 1 1 5 6 6 2 2 6 8 8 3 3 7 10 10 4 4 8 12 12
I guess that this is a bug, isn't it?
Arne
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