将paste()应用于data.frame

时间:2016-02-04 14:49:45

标签: r dplyr apply

我有一个数字data.frame,我想通过粘贴每个元素后面的%来改变它。

A <- data.frame(A = seq(1,10,1))
apply(A,1, function(x) paste0(A[x,],"%"))

这样可以正常工作,但是如果数据有小数位,apply会使每个条目加倍。

 B <- data.frame(B = seq(1,5.5,0.5))
apply(B,1, function(x) paste0(B[x,],"%"))

适用于dplyr

require(dplyr)
B %>% mutate(B = paste0(B,"%"))

但我想了解为什么应用解决方案失败。

1 个答案:

答案 0 :(得分:3)

你可以尝试

sapply(B,paste0,"%")

由于OP中的数据帧示例由单个向量组成,因此显示这适用于一般数据帧可能很有用:

B <- data.frame(x1 = seq(1,10,1), x2=seq(1,5.5,0.5))
sapply(B,paste0,"%")
#      x1    x2    
# [1,] "1%"  "1%"  
# [2,] "2%"  "1.5%"
# [3,] "3%"  "2%"  
# [4,] "4%"  "2.5%"
# [5,] "5%"  "3%"  
# [6,] "6%"  "3.5%"
# [7,] "7%"  "4%"  
# [8,] "8%"  "4.5%"
# [9,] "9%"  "5%"  
#[10,] "10%" "5.5%"