在dplyr包中,可以使用count()函数对数据框进行计数操作。count()函数可以接受一个或多个变量作为参数,并返回每个变量的计数结果。 要将列号用于dplyr::count(),可以使用dplyr的管道操作符%>%将数据框传递给count()函数,并在count()函数中使用列号来指定要计数的变量。
dplyr::n() returns “Error: Error: n() should only be called in a data context ” Related 2190 How do I count the occurrences of a list item? 2029 How to efficiently count the number of keys/properties of an object in JavaScript 1333 Count the number of occurrences of a character...
#count() is a convenient way to get a sense of the distribution of# values in a datasetstarwars %>%count(species)#> # A tibble: 38 × 2#> species n#> <chr> <int>#> 1 Aleena 1#> 2 Besalisk 1#> 3 Cerean 1#> 4 Chagrian 1#> 5 Clawdite 1#> 6 Droid 6#> 7 Dug 1#>...
在 MySQL 中，COUNT 函数是一个非常常用的聚合函数，它用于计算某列或某表达式在查询结果中出现的次数。
R语言 count()报错 1.数据集df 错误代码 > df%>%count(name) Error in count(., name) : object 'name' not found 正确代码 > df %>%dplyr::count(name,type)# 注意指定dplyr包 # A tibble: 6 x 3 name type n <chr> <chr> <int>...
The resulting count is stored in a variable namedrow_count, then theprint()method prints it. Output: [1] 1 Use thedplyrPackage to Count the Number of Rows in R dplyris a highly regarded R package designed for fast and efficient data manipulation. It provides a set of intuitive functions...
N), by = id]如果您愿意，它与dt[, list(count=.N), by = id]相同;这里.是list的别名。
Error in count(., name) : object 'name' not found > df %>% dplyr::count (name,type)# 注意指定dplyr包 A tibble: 6 x 3 name type n <chr> <chr> <int> 1 Alice english 1 2 Alice math...
dplyr::rowwise 和 dplyr::c_across 对总列的计数求和。 我们还可以使用 tidyr::pivot_longer 获得所需的长格式。 library(dplyr, warn.conflicts = FALSE) library(tidyr) cyl_gear_sum <- mtcars %>% count(cyl, gear) %>% pivot_wider(names_from = gear, values_from = n, values_fill = ...
r dplyr Share Copy link Improve this question Follow editedApr 29, 2020 at 17:25 askedApr 29, 2020 at 17:07 James 54133 silver badges1717 bronze badges 2 Answers Sorted by: 2 Let me know if this is what you were trying to do. In the code below we usecumsumto create groups, with ...