dplyt::符合因素和特征

我在运行dplyr::tally时遇到问题,原因和角色

> data %>% dplyr::tally(true_label)
Error: Problem with `summarise()` column `n`.
ℹ `n = sum(true_label, na.rm = TRUE)`.
x ‘sum’ not meaningful for factors
Run `rlang::last_error()` to see where the error occurred.

> rlang::last_error()
<error/dplyr_error>
Problem with `summarise()` column `n`.
ℹ `n = sum(true_label, na.rm = TRUE)`.
x ‘sum’ not meaningful for factors
Backtrace:
  1. data %>% dplyr::tally(true_label)
 12. base::.handleSimpleError(...)
 13. dplyr:::h(simpleError(msg, call))
Run `rlang::last_trace()` to see the full context


> data %>% dplyr::tally(as.character(true_label))
Error: Problem with `summarise()` column `n`.
ℹ `n = sum(as.character(true_label), na.rm = TRUE)`.
x invalid 'type' (character) of argument
Run `rlang::last_error()` to see where the error occurred.


> rlang::last_error()
<error/dplyr_error>
Problem with `summarise()` column `n`.
ℹ `n = sum(as.character(true_label), na.rm = TRUE)`.
x invalid 'type' (character) of argument
Backtrace:
  1. data %>% dplyr::tally(as.character(true_label))
 10. base::.handleSimpleError(...)
 11. dplyr:::h(simpleError(msg, call))
Run `rlang::last_trace()` to see the full context.

这也失败了:

> data %>% group_by(true_label) %>% summarise(n_label = n())
Error: `n()` must only be used inside dplyr verbs.
Run `rlang::last_error()` to see where the error occurred.

其他例子:

diamonds %>% tally(cut)

diamonds %>% group_by(as.factor(cut)) %>% summarise(n_label = n())

我相信 summarise 是dplyr动词,不是吗?

计算因素和人物的官方方法是什么?

dplyr版本1.0.7