在R中查找变量的类 [英] Finding the class of a variable in R

问题描述

所以我在使用R时遇到了这个问题。我有一个表，我需要查找变量的类是什么（即，我假设这将引用列中的数据）。

So I have this problem with R. I have a table and I need to find what is the class of the variable (i.e. I'm presuming that would be referring to the data in the columns).

数据很大，即行很多。

每当我编写 class（dataofname）不起作用，每当我写 class（ titleofthecolumn）时，它就会带回我字符，即引用列标题，这不是我追求...

Whenever I write class(nameofthedata) it doesn't work and whenever I write class("titleofthecolumn") it gives me back "character i.e. referring to the title of the column which is not what I'm after...

推荐答案

我建议以下解决方案：

# Load sample data
data(mtcars)
# Classes
sapply(mtcars, class)

您可以轻松地识别数据框中所有变量的类：

You can the convinetly identify classes of all variables in the data frame:

>> t(t(sapply(mtcars, class)))
     [,1]     
mpg  "numeric"
cyl  "numeric"
disp "numeric"
hp   "numeric"
drat "numeric"
wt   "numeric"
qsec "numeric"
vs   "numeric"
am   "numeric"
gear "numeric"
carb "numeric"

t（）仅用于代码演示。

t() used only for the code presentation.

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