Convert radians to degree / degree to radians

Question

Are there build-in functions in R for the conversion of radians to degree and degree to radians?

So far I wrote my one own functions:

rad2deg <- function(rad) {(rad * 180) / (pi)}
deg2rad <- function(deg) {(deg * pi) / (180)}

#test:
rad2deg(pi) #180
rad2deg(2*pi) #360
deg2rad(180) #pi

`install.packages("sos", dependencies = TRUE); library(sos); findFn("convert degree to radian")`. — , Sep 03 '15 at 08:22
I am a little surprised that after all these years, R doesn't have a built in function to convert between degree and radian! Must we install extension to support it? At this point, I'd rather take OP's solution to achieve what I need — Antony, Sep 20 '17 at 20:08

score 12 · Accepted Answer · answered Sep 03 '15 at 09:33

12

The comment of Pascal was very useful and I found several ones, e.g.

install.packages("NISTunits", dependencies = TRUE)
library(NISTunits)

NISTdegTOradian(180)
NISTradianTOdeg(pi)

answered Sep 03 '15 at 09:33

Iris

992
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score 10 · Answer 2 · answered Oct 03 '18 at 18:34

10

You can use the units package for this.

library(units)
pi_rad <- as_units(pi, "radians")
pi_deg <- set_units(pi_rad, "degrees")
set_units(pi_deg, "radians")

answered Oct 03 '18 at 18:34

jsta

2,890
25
32

score 0 · Answer 3 · answered Jun 12 '16 at 01:40

0

If you have a data.frame It could help you

In my case davis_2$wd is the column in degree

#Add column to Data Base
davis_2$radian_wd = davis_2$wd

#Create a loop to change the data, and change the 62'th col to Radians
for(i in 1:nrow(davis_2)){
    davis_2[i, 62] = (davis_2[i, 62]*pi)/180
}
# Review
head(davis_2$radian_wd)

answered Jun 12 '16 at 01:40

Edwin Torres

119
2
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2

It's unnecessary to write a loop: `davis_2$radian_wd – Iris Jun 12 '16 at 17:27

Convert radians to degree / degree to radians

3 Answers3

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