On Tue, 7 May 2002, ken_lee wrote:
|Dear all,
| Sometime I need to change data column name,but I catn't do it.
Hi,
one way to change the column name in data.frame is to use names().
>
e.g.test<-data.frame(class=c("a","a","a","b","b"),value=1:5)
> names(test)[2] <- "foo"
> test
class foo
1 a 1
2 a 2
3 a 3
4 b 4
5 b 5
You should ensure that the names are unique. You can also try a more
intelligent way:
> names(test)[which(names(test)=="foo")] <- "bar"
> test
class bar
1 a 1
2 a 2
3 a 3
4 b 4
5 b 5
In your example, you may use a similar method, e.g. build a list (remember
that data.frame is actually a list) without the names and thereafter to give
them names:
|example:
| type<-c("max","min")
|
test<-data.frame(class=c("a","a","a","b","b"),value=1:5)
|
| for (i in 2:length(type)) {
| tmp<-gsummary(test,FUN=type[i],groups=test$class)
| tmp1<-data.frame(class=tmp$class, type[i] = tmp$value)
|
... error... : I catn't assign "max" by type[i]
| }
tmp1 <- list(tmp$class, tmp$value)
names(tmp1) <- c("class", type[i])
tmp1 <- as.data.frame(tmp1)
should work.
Cheers,
Ott
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