On 7/15/2009 10:35 AM, Tom Liptrot wrote:
Hi R helpers,
I have a data frame and I want to change the column names to names I have held
in another data frame, but I am having difficulty. All data framnes are large
so i can't input manually. Below is what i have tried so far:
df<-data.frame(a=1:5, b=2:6, d=3:7, e=4:8)
coltitles<-data.frame(v1="col number one", v2="col number two", v3="col number three",
v4="col number four")
##first attempt
names(df)<-coltitles
names(df)
[1] "1" "1" "1" "1" ###not what i wanted as I want names(df) to return [1] "col number one" "col
number two" "col number three" "col number four"
Not sure if my first reply went out; it had an error in it, because I
misread what you were trying to do.
You want to assign a character vector as names. You can set it up like
that originally using
coltitles <- c("col number one", "col number two", "col number three",
"col number four")
and then your first attempt will work. If you need to get the names out
of a dataframe, then use
names(x) <- coltitles[1,]
to select the first row (or select some other row if you want) of the
dataframe to use as names.
Duncan Murdoch
##second attempt
coltitles<-as.vector(coltitles, mode="character") ##trying to convert to a
character vector after looking at help
is.vector(coltitles)
[1] TRUE
names(df)<-coltitles
names(df)
[1] "1" "1" "1" "1" ###again not what I wanted
How can I convert the column names?
Thanks in advance,
Tom
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