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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
...ith the daply function, as shown here: https://stackoverflow.com/a/7020101/210673
library(plyr)
daply(tmp, .(x, y), function(x) x$z)
## y
## x a b c
## x 1 2 3
## y 3 3 2
Using matrix indexing:
This is kinda old school but is a nice demonstration of matrix indexing, which can be really ...
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