Mutating dummy variables in dplyr

Question

I want to create 7 dummy variables -one for each day, using dplyr

So far, I have managed to do it using the sjmisc package and the to_dummy

Answer 1

An alternative solution using dummies() which I think would be quicker would be

mydf = data.frame(x=rep(letters[1:9]),
               day=c("Mon","Tues","Wed","Thurs","Fri","Sat","Sun","Fri","Mon"))


library(dummies)

mydf <- cbind(mydf, dummy(mydf$day, sep = "_"))

That yields

x   day mydf_Fri mydf_Mon mydf_Sat mydf_Sun mydf_Thurs mydf_Tues mydf_Wed
1 a   Mon        0        1        0        0          0         0        0
2 b  Tues        0        0        0        0          0         1        0
3 c   Wed        0        0        0        0          0         0        1
4 d Thurs        0        0        0        0          1         0        0
5 e   Fri        1        0        0        0          0         0        0
6 f   Sat        0        0        1        0          0         0        0
7 g   Sun        0        0        0        1          0         0        0
8 h   Fri        1        0        0        0          0         0        0
9 i   Mon        0        1        0        0          0         0        0

Then you can use gsub() to have cleaner names

names(mydf) = gsub("mydf_", "", names(mydf))
head(mydf)
  x   day Fri Mon Sat Sun Thurs Tues Wed
1 a   Mon   0   1   0   0     0    0   0
2 b  Tues   0   0   0   0     0    1   0
3 c   Wed   0   0   0   0     0    0   1
4 d Thurs   0   0   0   0     1    0   0
5 e   Fri   1   0   0   0     0    0   0
6 f   Sat   0   0   1   0     0    0   0