在R中使用ifelse on factor [英] Using ifelse on factor in R

问题描述

我正在重组物种名称的数据集。它有一个带有拉丁名称的列和具有琐碎名称的列，当这些可用时。我想制作第3列，在可用时给出简单的名称，否则为拉丁名称。琐碎的名字和拉丁名字都属于因子级。
我试过if-loop：

I am restructuring a dataset of species names. It has a column with latin names and column with trivial names when those are available. I would like to make a 3rd column which gives the trivial name when available, otherwise the latin name. Both trivial names and latin names are in factor-class. I have tried with an if-loop:

  if(art2$trivname==""){  
    art2$artname=trivname   
    }else{  
      art2$artname=latname  
    }  

它给了我正确的trivnames，但只在提供拉丁名字时给出NA。

当我使用ifelse时我只得到数字。

It gives me the correct trivnames, but only gives NA when supplying latin names.
And when I use ifelse I only get numbers.

一如既往，所有帮助表示赞赏：）

As always, all help appreciated :)

推荐答案

示例：

art <- data.frame(trivname = c("cat", "", "deer"), latname = c("cattus", "canis", "cervus"))
art$artname <- with(art, ifelse(trivname == "", as.character(latname), as.character(trivname)))
print(art)
#   trivname latname artname
# 1      cat  cattus     cat
# 2            canis   canis
# 3     deer  cervus    deer

（我认为默认选项（stringsAsFactors = FALSE）对大多数人来说会更容易，但是你去......）

(I think options(stringsAsFactors = FALSE) as default would be easier for most people, but there you go...)

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