Add a numerical value to a column of factors which are already numerical

Asked Dec 29 '15 at 23:12

Active Dec 29 '15 at 23:12

Viewed 39 times

I have a data.frame z with columns Tracer, angle and treatment, where angle and treatment are factors.

levels(z$angle)
[1] "0"  "15" "30" "45" "60" "80" "90"

I'd like to add the value of 150 to the numeric value in angle e.g. if angle is 30 then it would become 180, 45 would be 195, etc.

Why doesn't this work?:

z$bigangle<-z$angle +150

I've read this post but can't really work that out as I don't already have the column bigangle: Replace contents of factor column in R dataframe

Any help would be much appreciated, Cheers

edited May 23 '17 at 12:31

Community

asked Dec 29 '15 at 23:12

HCAI

2

Because you don't have a numeric, you have a factor. `z$bigangle = 150 + as.numeric(as.character(z$angle))` should do it. You can wrap the whole thing in `factor()` if you want it to end up as a factor at the end. – Gregor Thomas Dec 29 '15 at 23:14
2

Possible dupe: http://stackoverflow.com/q/3418128/903061 – Gregor Thomas Dec 29 '15 at 23:14
Thank you, that was suuuper fast! – HCAI Dec 29 '15 at 23:18

0 Answers0