Question

我的数据集名称如下;

Col A Col B Col C

            Brook

            Ram

            Sunny

            Mike

            Crook

            David

我想用＆＃34; Hello Wolrd＆＃34;替换B列中的空白。所有那些列c值与＆＃34; Brook＆＃34;，＆＃34; crook＆＃34;，＆＃34; David＆＃34;。

对此非常感谢。感谢

Answer 1

df$colB[df$colB=="" & df$colC %in% c("Brook", "crook", "David")] <- "Hello Wolrd"

Answer 2

也许是ifelse声明：

> df <- data.frame(A = "", B = "", C = c("Brook", "Ram", "Sunny", "Mike", "Crook", "David"), stringsAsFactors=FALSE)
> df
  A B     C
1     Brook
2       Ram
3     Sunny
4      Mike
5     Crook
6     David
> df$B <- ifelse(df$C %in% c("Brook", "Crook", "David"), "Hello World", "")
> df
  A           B     C
1   Hello World Brook
2                 Ram
3               Sunny
4                Mike
5   Hello World Crook
6   Hello World David

根据R中的列c值替换列中的空白

2 个答案: