Текст коллапса от группы в DataFrame R
# You want to aggregate text by group
df <- read.table(header=T, text="
group text
a a1
a a2
a a3
b b1
b b2
c c1
c c2
c c3
")
aggregate(df$text, list(df$group), paste, collapse="")
## Group.1 x
## 1 a a1a2a3
## 2 b b1b2
## 3 c c1c2c3
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