R语言 levels()用法及代码示例

levels()R语言中的函数用于获取或设置因子的级别。

用法： levels(x)

参数：
x:因子对象

范例1：


# R program to get levels of a factor
  
# Creating a factor
gender <- factor(c("female", "male", "male", "female")); 
gender
  
# Calling levels() function
# to get the levels
levels(gender)

输出：

[1] female male   male   female
Levels:female male
[1] "female" "male"

范例2：


# R program to set levels of a factor
  
# Creating a factor
gender <- factor(c("female", "male", "male", "female")); 
gender
  
# Calling levels() function
# to set the levels
levels(gender) <- c("abc", "def")
gender

输出：

[1] female male   male   female
Levels:female male
[1] abc def def abc
Levels:abc def

相关用法

注：本文由纯净天空筛选整理自nidhi_biet大神的英文原创作品 Get or Set Levels of a Factor in R Programming – levels() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。