Changing column names of a data frame
I have a data frame called "newprice" (see below) and I want to change the column names in my program in R.
> newprice
Chang. Chang. Chang.
1 100 36 136
2 120 -33 87
3 150 14 164
In fact this is what am doing:
names(newprice)[1]<-paste("premium")
names(newprice)[2]<-paste("change")
names(newprice)[3]<-paste("newprice")
I have not put this in a loop because I want each column name to be different as you see.
When I paste my program into R console this is the output it gives me:
> names(newprice)[1]<-paste(“premium”)
Error: unexpected input in "names(newprice)[1]<-paste(“"
> names(newprice)[2]<-paste(“change”)
Error: unexpected input in "names(newprice)[2]<-paste(“"
> names(newprice)[3]<-paste(“newpremium”)
Error: unexpected input in "names(newprice)[3]<-paste(“"
I have equally tried using the c() function-for example c("premium") , instead of the paste() function, but to no avail.
Could someone help me to figure this out?
Use the colnames() function:
R> X <- data.frame(bad=1:3, worse=rnorm(3))
R> X
bad worse
1 1 -2.440467
2 2 1.320113
3 3 -0.306639
R> colnames(X) <- c("good", "better")
R> X
good better
1 1 -2.440467
2 2 1.320113
3 3 -0.306639
You can also subset:
R> colnames(X)[2] <- "superduper"
我使用这个：
colnames(dataframe)[which(names(dataframe) == "columnName")] <- "newColumnName"
The error is caused by the "smart-quotes" (or whatever they're called). The lesson here is, "don't write your code in an 'editor' that converts quotes to smart-quotes".
names(newprice)[1]<-paste(“premium”) # error
names(newprice)[1]<-paste("premium") # works
Also, you don't need paste("premium") (the call to paste is redundant) and it's a good idea to put spaces around <- to avoid confusion (eg x <- -10; if(x<-3) "hi" else "bye"; x ).
下一篇: 更改数据框的列名称