根据R中的唯一值将一列数据细分为多个列

Question

I have a dataset of the form:

Dataset 1

I need to convert the above data into the following in R:

Dataset 2

How can it be done? It should be simple but I am not able to figure out the correct function or steps to do this. Any help would be much appreciated. Thank you

Answer 1

I'd use data.table for this:

library(data.table)
df1 = data.frame("A"=c(1,1,1,2,2),"B"=6:10)

df2 = data.table::dcast(df1,B~A,value.var="B")