R如何根据其他列中的字符串值定义新的列变量

Question

这是一个重复的问题。

如何从此数据框中实现

Treatment = c("HS","C","H","S","TR")
BlockID = c(1,1,1,1,1)
PlotID = c(1,2,4,5,6)
Data = c(2003,2003,2003,2003,2003)

df = data.frame(Treatment,BlockID,PlotID,Data)

其中包含字符串值的新列：

New Column
HS12003
C12003
H12003
S12003
TR12003

我不知道如何“加和”字符串字符。预先感谢！

Answer 1

您可以使用do.call来评估paste0，即

do.call(paste0, df[-3])
#[1] "HS12003" "C12003"  "H12003"  "S12003"  "TR12003"

Answer 2

您需要使用paste0()

df$pasted <- paste0(df$Treatment, df$BlockID, df$Data)

#   Treatment BlockID PlotID Data  pasted
# 1        HS       1      1 2003 HS12003
# 2         C       1      2 2003  C12003
# 3         H       1      4 2003  H12003
# 4         S       1      5 2003  S12003
# 5        TR       1      6 2003 TR12003

dplyr解决方案：

library(dplyr)
df %>% 
  mutate(pasted = paste0(Treatment, BlockID, Data))