Solidifying a melted data frame?

Question

Assuming I have a melted data.frame that looks like this:

  variable       value
1         A -0.19933093
2         A -1.19043346
3         A -1.         


        

Answer 1

Using acast() to return a matrix. It needs an id variable.

library(reshape2)
dat <- read.table(text = "variable       value
1         A -0.19933093
2         A -1.19043346
3         A -1.32248172
4         A -1.98644507
5         A -0.07930953
6         B -0.10074686
7         B  0.72451483
8         B -0.40914044
9         B  0.02913376
10        B  0.16062491",sep = "",header = TRUE)

dat$id = rep(1:5, 2)
dat

acast(dat, id~variable)