我有以下内容:
df <- data.frame(ID = c(1,1,1,1,1,1,1,1,1,1,2,2,2),
Obs = c(0,1, 1, 0, 1,0,0, 1, 1, 1, 0,0,1))
我想要这个:
df <- data.frame(ID = c(1,1,1,1,1,1,1,1,1,1,2,2,2),
Obs = c(0,1, 1, 0, 1,0,0, 1, 1, 1, 0,0,1),
Cluster = c(0,1,1,1,2,2,2,3,3,3,0,0,1))
如何使用dplyr获取“簇”列,其中必须对数字1进行排序,直到出现第一个0为止?
连续的0必须保持该值,直到出现新的1。
编辑
如果有很多列,我该怎么做?
假设我有99个obs列,并且我想创建99个群集,每列一个。像这样:
df <- data.frame(ID = c(1,1,1,1,1,1,1,1,1,1,2,2,2),
Obs1 = c(0,1, 1, 0, 1,0,0, 1, 1, 1, 0,0,1),
Obs2 = c(0,0, 0, 1, 1,1,0, 1, 0, 1, 0,0,1),
ClusterObs1 = c(0,1,1,1,2,2,2,3,3,3,0,0,1),
ClusterObs2 = c(0,0,0,1,1,1,1,2,2,3,0,0,1))
答案 0 :(得分:7)
以下是使用rle
的选项:
df %>%
group_by(ID) %>%
mutate(clust = with(rle(Obs), rep(cumsum(values == 1), lengths)))
# # A tibble: 13 x 4
# # Groups: ID [2]
# ID Obs Cluster clust
# <dbl> <dbl> <dbl> <int>
# 1 1. 0. 0. 0
# 2 1. 1. 1. 1
# 3 1. 1. 1. 1
# 4 1. 0. 1. 1
# 5 1. 1. 2. 2
# 6 1. 0. 2. 2
# 7 1. 0. 2. 2
# 8 1. 1. 3. 3
# 9 1. 1. 3. 3
# 10 1. 1. 3. 3
# 11 2. 0. 0. 0
# 12 2. 0. 0. 0
# 13 2. 1. 1. 1
这是它的主要部分:
rle(df$Obs)
#Run Length Encoding
# lengths: int [1:8] 1 2 1 1 2 3 2 1
# values : num [1:8] 0 1 0 1 0 1 0 1
这告诉您Obs列中每个1s或0s的长度是多长时间(我暂时忽略了ID分组)。
我们现在需要的是累计计算1的条纹次数,并简单地累加值1的累加。
with(rle(df$Obs), cumsum(values == 1))
#[1] 0 1 1 2 2 3 3 4
到目前为止,到目前为止,我们需要将这些值重复较长的次数,因此,我们使用来自rep
和lengths
的rle信息:
with(rle(df$Obs), rep(cumsum(values == 1), lengths))
# [1] 0 1 1 1 2 2 2 3 3 3 3 3 4
最后,我们按ID组进行操作。
如果您需要为不同的obs-columns创建多个cluster-columns,则可以轻松地按以下步骤进行操作:
df %>%
group_by(ID) %>%
mutate_at(vars(starts_with("Obs")),
funs(cluster= with(rle(.), rep(cumsum(values == 1), lengths))))
# # A tibble: 13 x 7
# # Groups: ID [2]
# ID Obs1 Obs2 ClusterObs1 ClusterObs2 Obs1_cluster Obs2_cluster
# <dbl> <dbl> <dbl> <dbl> <dbl> <int> <int>
# 1 1. 0. 0. 0. 0. 0 0
# 2 1. 1. 0. 1. 0. 1 0
# 3 1. 1. 0. 1. 0. 1 0
# 4 1. 0. 1. 1. 1. 1 1
# 5 1. 1. 1. 2. 1. 2 1
# 6 1. 0. 1. 2. 1. 2 1
# 7 1. 0. 0. 2. 1. 2 1
# 8 1. 1. 1. 3. 2. 3 2
# 9 1. 1. 0. 3. 2. 3 2
# 10 1. 1. 1. 3. 3. 3 3
# 11 2. 0. 0. 0. 0. 0 0
# 12 2. 0. 0. 0. 0. 0 0
# 13 2. 1. 1. 1. 1. 1 1
其中df是:
df <- data.frame(ID = c(1,1,1,1,1,1,1,1,1,1,2,2,2), Obs1 = c(0,1, 1, 0, 1,0,0, 1, 1, 1, 0,0,1), Obs2 = c(0,0, 0, 1, 1,1,0, 1, 0, 1, 0,0,1), ClusterObs1 = c(0,1,1,1,2,2,2,3,3,3,0,0,1), ClusterObs2 = c(0,0,0,1,1,1,1,2,2,3,0,0,1))
答案 1 :(得分:2)
这是一个很有趣的问题,因此这里有一个data.table解决方案:
# Packages used
library(data.table)
library(magrittr)
# Setup
setDT(df)
df[, Obs := as.integer(Obs)]
# Calculations
df[, Cluster := cumsum(!Obs), by = ID] %>%
.[, Cluster := Cluster - rowid(Obs) * !Obs, by = rleid(Obs)] %>%
.[, Cluster := frank(Cluster, ties.method = "dense") - 1L, by = ID]
df
ID Obs Cluster
1: 1 0 0
2: 1 1 1
3: 1 1 1
4: 1 0 1
5: 1 1 2
6: 1 0 2
7: 1 0 2
8: 1 1 3
9: 1 1 3
10: 1 1 3
11: 2 0 0
12: 2 0 0
13: 2 1 1