Ifelse根据查找

Question

我有一个名为data.frame的{​​{1}}，我希望通过查看一列expC中的字符是否等于查找向量中指定的字符来创建新列：

spc

对于east <-c("AL","CB","CM","CO","EN","HA","HP","IG","IP","LU","NR","PE","RM","SG","SS","WD")向量中expC$spc中的字符，如果不返回east则返回1。

我非常感谢你的帮助。谢谢。

Answer 1

试试这个：

expC$ee = as.numeric(expC$spc %in% east)

Answer 2

使用ifelse

# dummy data
east <- letters[1:5]
expC <- data.frame(spc = sample(letters, 100, replace = T))

expC$newVar <- with(expC, ifelse(spc %in% east, 1, 0))

> head(expC)
  spc newVar
1   q      0
2   q      0
3   q      0
4   w      0
5   b      1
6   r      0