如何根据R中的条件添加列 [英] how can i add a column based on condition in R

问题描述

我有像这样的df（data1）

i have df(data1) like this

 internode_length treatment genotype
1           98.165       sun       B3
2          116.633       sun       B3
3          103.474       sun       B3
4          120.683       sun       B3
5          109.128       sun       B3
6          129.076       sun       B3

我想根据条件为此df添加一个单独的列

And i want to add a separate column to this df based on condition

for i in (1:nrow(data1)){
  if (data1$genotype == "B3") {
      data1$mutation = "wt"
} else if (data1$genotype == "ein9" & "ein194"){
      data1$mutation = "phyB"
} else {
      data1$mutation = "hy2"
}
}

但是我收到此错误并发出警告并且无法正常工作

But i am getting this error and warning and also it does not work

Error: unexpected symbol in "for i"
>   if (data1$genotype == "B3") {
+       data1$mutation = "wt"
+ } else if (data1$genotype == "ein9"){
+       data1$mutation = "phyB"
+ } else {
+       data1$mutation = "hy2"
+ }
Warning message:
In if (data1$genotype == "B3") { :
  the condition has length > 1 and only the first element will be used
> }
Error: unexpected '}' in "}"

有什么建议可以解决这个问题吗？

Any suggestions to fix this?

推荐答案

你应该使用 ifelse ：

transform(data1,
          mutation = ifelse (genotype == "B3",  "wt",
          ifelse (genotype %in% c("ein9","ein194"),
                  "phyB", "hy2")))

#      internode_length treatment genotype mutation
# 1           98.165       sun       B3       wt
# 2          116.633       sun       B3       wt
# 3          103.474       sun     ein9     phyB
# 4          120.683       sun       B3       wt
# 5          109.128       sun   ein194     phyB
# 6          129.076       sun       A2      hy2

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