如何解决报错信息：Error in UseMethod(“filter_”) 在使用dplyr包的filter() 时候

清疚 2022-11-07 01:56 323阅读 0赞

报错信息如下：

Error in UseMethod("filter_") : 
      no applicable method for 'filter_' applied to an object of class "character"
    Calls: %>% ... freduce -> <Anonymous> -> filter -> filter.default -> filter_
    In addition: Warning message:
    `filter_()` is deprecated as of dplyr 0.7.0.
    Please use `filter()` instead.
    See vignette('programming') for more help
    This warning is displayed once every 8 hours.
    Call `lifecycle::last_warnings()` to see where this warning was generated. 
    Execution halted

最开始我以为这个method是我用错了成filter\_,

后面经过查询脚本和网上资料才知道，是因为输入的文件不是tibble、data.frame格式。

情况1: 忘记读入文件了,我是因为这个原因报错

file <- args[1]

情况2：当然还有可能是输入的是matrix，这时候需要把matrix转换成data.frame格式

例子如下

> a <- matrix(1:9, ncol =3)
    > colnames(a) <- c("test1","test2","test3")
    > a
         test1 test2 test3
    [1,]     1     4     7
    [2,]     2     5     8
    [3,]     3     6     9
    > filter(a, test1 == 2)

报错信息

![20210310180831819.png][]

转换成为tibble/data.frame这个报错就没有了

> filter(as_tibble(a), test1 == 2)
    # A tibble: 1 x 3
      test1 test2 test3
      <int> <int> <int>
    1     2     5     8

参考ref：（感谢参考帖子）

[https://stackoverflow.com/questions/57286838/how-to-fix-dplyr-filter-error-in-usemethodfilter][https_stackoverflow.com_questions_57286838_how-to-fix-dplyr-filter-error-in-usemethodfilter]

[20210310180831819.png]: /images/20221023/23af1cfe606d4dd5b8cf21bde5bb01ab.png
[https_stackoverflow.com_questions_57286838_how-to-fix-dplyr-filter-error-in-usemethodfilter]: https://stackoverflow.com/questions/57286838/how-to-fix-dplyr-filter-error-in-usemethodfilter