After using cast (out of reshape) the column names of a data.table has changed.
tmp <- data.table(
ID = c(611557L, 611557L, 611557L, 894125L, 894125L, 894125L, 894125L, 894125L, 898856L, 898856L, 898856L, 898856L, 898856L, 898856L, 898899L, 898899L, 898899L),
DATUM = structure(c(16101, 16071, 16261, 16104, 16133, 16167, 16201, 16236, 16089, 16118, 16147, 16176, 16236, 16208, 16163, 16125, 16209), class = "Date"),
N = c(25L, 9L, 23L, 29L, 26L, 26L, 27L, 28L, 39L, 39L, 38L, 36L, 40L, 39L, 19L, 20L, 19L),
rank = c(2, 1, 3, 1, 2, 3, 4, 5, 1, 2, 3, 4, 6, 5, 2, 1, 3)
)
names(tmp)
# [1] "ID" "DATUM" "N" "rank"
cast(tmp, ID ~ rank, value = "DATUM")
names(tmp)
# [1] "ID" "value" "N" "rank"
Using dcast (out of reshape2) for the data.table or cast (out of reshape) for a data.frame don't change anything.
After using cast (out of reshape) the column names of a data.table has changed.
Using dcast (out of reshape2) for the data.table or cast (out of reshape) for a data.frame don't change anything.