如何从R中的表中提取计数作为向量? [英] How to extract counts as a vector from a table in R?

问题描述

我正在尝试编写一个函数来提取此表的频率:

I'm trying to write a function to extract the frequencies of this table:

 0  1  2  3  4  5  6  7
30 22  9 12  2  5  1 16

所以我想得到c(30, 22, 9, 12, 2, 5, 1, 16).

每次运行函数时表都会更改，因此我需要一些可以自动从表中提取信息的东西，因此不必每次都编写c()函数.

The table changes each time I run the function, so I need something that can extract the information from the table automatically, so I don't have write a c() function each time.

推荐答案

让我们从table()创建一个结果对象并对其进行检查:

Let's create a results object from table() and examine it:

> set.seed(42)                          ## be reproducible
> X <- sample(1:5, 50, replace=TRUE)    ## our data
> table(X)                              ## our table
X
 1  2  3  4  5 
 7  6  9 10 18 
> str(table(X))                         ## look at structure of object
 'table' int [1:5(1d)] 7 6 9 10 18
 - attr(*, "dimnames")=List of 1
  ..$ X: chr [1:5] "1" "2" "3" "4" ...
> as.integer(table(X))                  ## and just convert to vector
[1]  7  6  9 10 18
> as.numeric(table(X))                  ## or use `numeric()`
[1]  7  6  9 10 18
> 

为完整性起见，还有另外两种获取数据的方法:

And for completeness, two more ways to get the data:

> unname(table(X))                      ## jdropping names reduces to the vector
[1]  7  6  9 10 18
> table(X)[]                            ## or simply access it
[1]  7  6  9 10 18
> 

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