在R中将多行粘贴在一起
我有一个数据框,我想得到第1行与第2行粘贴的矩阵,第3行与第4行粘贴的矩阵,如果数据框有奇数行,保持最后一行不变,而不是粘贴行、粘贴列1和列2、列3和列4,矩阵将为:在R中将多行粘贴在一起,r,matrix,apply,paste,R,Matrix,Apply,Paste,我有一个数据框,我想得到第1行与第2行粘贴的矩阵,第3行与第4行粘贴的矩阵,如果数据框有奇数行,保持最后一行不变,而不是粘贴行、粘贴列1和列2、列3和列4,矩阵将为: data <- data.frame(name = c(1:4), plate=c("A","B","C","D"), value1=c(4:7), value2 = c(100, 200, 300, 400)) data name plate value1 value2 1 A 4
data <- data.frame(name = c(1:4), plate=c("A","B","C","D"), value1=c(4:7), value2 = c(100, 200, 300, 400))
data
name plate value1 value2
1 A 4 100
2 B 5 200
3 C 6 300
4 D 7 400
矩阵按列粘贴的结果:
name-plate value1-value2
1-A 4-100
2-B 5-200
3-C 6-300
4-D 7-400
我知道如何将它们粘贴在一起,但我不知道如何分别粘贴
> apply( data[,1:4] , 1, paste , collapse = "-" )
[1] "1-A-4-100" "2-B-5-200" "3-C-6-300" "4-D-7-400"
感谢您的帮助。您可能可以从以下内容开始,提取奇数
(数据[c(T),F),])
和偶数(数据[c(F,T),])
行,并使用mapply
函数同时循环并粘贴它们。类似的逻辑也适用于列
mapply(paste, sep = "-", data[c(T,F),], data[c(F,T),])
# - <NA> <NA> <NA>
# [1,] "1-2" "A-B" "4-5" "100-200"
# [2,] "3-4" "C-D" "6-7" "300-400"
mapply(paste, sep = "-", dat[,c(T,F)], dat[,c(F,T)])
# - <NA>
# [1,] "1-A" "4-100"
# [2,] "2-B" "5-200"
# [3,] "3-C" "6-300"
注意:这不会处理奇数行或奇数列的情况,因此您将需要一些努力来处理它。我们可以使用
lappy
as.data.frame(t(sapply(seq(1, nrow(data), by = 2), function(i)
apply(data[i:(i+1),], 2, paste, collapse="-"))))
# name plate value1 value2
#1 1-2 A-B 4-5 100-200
#2 3-4 C-D 6-7 300-400
setNames(as.data.frame(sapply(seq(1, nrow(data), by = 2), function(i)
apply(data[,i:(i+1)], 1, paste, collapse="-"))), c("name-plate", "value1-value2"))
# name-plate value1-value2
#1 1-A 4-100
#2 2-B 5-200
#3 3-C 6-300
#4 4-D 7-400
另一种方法是使用tidyr包中的unite函数
library(tidyr)
data <- data.frame(name = c(1:4),
plate=c("A","B","C","D"),
value1=c(4:7),
value2 = c(100, 200, 300, 400))
data %>%
unite("name-plate", name, plate, remove = T, sep = "-") %>%
unite("value1-value2", value1, value2, remove = T, sep = "-")
# outputs the following data.frame
name-plate value1-value2
1 1-A 4-100
2 2-B 5-200
3 3-C 6-300
4 4-D 7-400
library(tidyr)
数据%
联合(“铭牌”,名称,铭牌,移除=T,sep=“-”)%>%
联合(“value1-value2”,value1,value2,remove=T,sep=“-”)
#输出以下数据帧
铭牌值1-2
11-A4-100
2-B 5-200
3-C 6-300
4-D 7-400
as.data.frame(t(sapply(seq(1, nrow(data), by = 2), function(i)
apply(data[i:(i+1),], 2, paste, collapse="-"))))
# name plate value1 value2
#1 1-2 A-B 4-5 100-200
#2 3-4 C-D 6-7 300-400
setNames(as.data.frame(sapply(seq(1, nrow(data), by = 2), function(i)
apply(data[,i:(i+1)], 1, paste, collapse="-"))), c("name-plate", "value1-value2"))
# name-plate value1-value2
#1 1-A 4-100
#2 2-B 5-200
#3 3-C 6-300
#4 4-D 7-400
library(tidyr)
data <- data.frame(name = c(1:4),
plate=c("A","B","C","D"),
value1=c(4:7),
value2 = c(100, 200, 300, 400))
data %>%
unite("name-plate", name, plate, remove = T, sep = "-") %>%
unite("value1-value2", value1, value2, remove = T, sep = "-")
# outputs the following data.frame
name-plate value1-value2
1 1-A 4-100
2 2-B 5-200
3 3-C 6-300
4 4-D 7-400