Generate combination of data frame and vector

Question

I know expand.grid is to create all combinations of given vectors. But is there a way to generate all combinations of a data frame and a vector by taking each r

Answer 1

You could also do something like this

do.call(rbind,lapply(9:10, function(x,d) data.frame(d, c=x), d=df)))

# or using rbindlist as a fast alternative  to do.call(rbind,list)
library(data.table)
rbindlist(lapply(9:10, function(x,d) data.frame(d, c=x), d=df)))

or

rbindlist(Map(data.frame, c = 9:10, MoreArgs = list(a= 1:3,b=5:7)))