如何创建数字循环? [英] How can I create the cycle of numbers?
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问题描述
我正在使用 R,不知道是否有人可以帮助我.我想变换这个向量:
I am using R, and wonder if anyone can help me this. I want to transform this vector:
y<-c(1,1,1,1,2,2,3,3,3,4,4,4)
到
y<-c(1,2,3,4,1,2,1,2,3,1,2,3)
所以我可以执行以下操作:
So I can do the following:
v<-c(rep("a",4), rep("b",2), rep("c",3), rep("d",3))
paste (v, y, sep="")
[1] "a1" "a2" "a3" "a4" "b1" "b2" "c1" "c2" "c3" "d1" "d2" "d3"
推荐答案
这里有几个选项:
f1 <- function(x) {
paste0(letters[x], unlist(tapply(x,x, seq_along)))
}
f1(y)
# [1] "a1" "a2" "a3" "a4" "b1" "b2" "c1" "c2" "c3" "d1" "d2" "d3"
f2 <- function(x) {
x <- letters[x]
ll <- unique(x)
make.unique(c(ll, x), sep="")[-seq_len(length(ll))]
}
f2(y)
# [1] "a1" "a2" "a3" "a4" "b1" "b2" "c1" "c2" "c3" "d1" "d2" "d3"
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