[英]How do I convert/reshape a data frame in long format to a wide format without aggregating the records?
由此:
> test <- data.frame(x = c("a","a","a"), y = c("b","b","c"), z = c(1,2,1))
> test
x y z
1 a b 1
2 a b 2
3 a c 1
对此:
x b c
1 a 1 NA
2 a 2 NA
3 a NA 1
由于test
数据框中的x
列不能唯一标识行,但您不想进行任何聚合,因此您需要使用唯一id
列扩充数据框,然后使用dcast()
来自reshape2
package:
require(reshape2)
test$id <- 1:nrow(test)
> dcast(test, id + x ~ y, value_var = 'z')[,-1]
x b c
1 a 1 NA
2 a 2 NA
3 a NA 1
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