R:根据元素长度从向量中删除元素 [英] R: Deleting elements from a vector based on element length

问题描述

如何根据字符串的字符数或长度从字符串向量中删除元素?

How can I delete elements from a vector of strings depending on the number of characters or length of the strings?

df <- c("asdf","fweafewwf","af","","","aewfawefwef","awefWEfawefawef")
> df
[1] "asdf"            "fweafewwf"       "af"              ""                ""                "aewfawefwef"     "awefWEfawefawef"

例如，我可能想删除 df 中长度小于 5 的所有元素，因此输出将是:

For example, I may want to delete all elements of df with a length smaller than 5, so the output would be:

> df
[1]"fweafewwf"        "aewfawefwef"     "awefWEfawefawef"

谢谢！

推荐答案

只需使用nchar:

> df[nchar(df) > 5]
[1] "fweafewwf"       "aewfawefwef"     "awefWEfawefawef"

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