mutate()
R语言中的函数用于在 DataFrame 中添加新变量,这些变量是通过对现有变量进行操作而形成的。
用法: mutate(x, expr)
参数:
x:数据帧
expr:对变量的操作
范例1:
# R program to add new variables
# in a data frame
# Loading library
library(dplyr)
# Create a data frame
d <- data.frame( name = c("Abhi", "Bhavesh", "Chaman", "Dimri"),
age = c(7, 5, 9, 16),
ht = c(46, NA, NA, 69),
school = c("yes", "yes", "no", "no") )
# Calculating a variable x3 which is sum of height
# and age printing with ht and age
mutate(d, x3 = ht + age)
输出:
name age ht school x3 1 Abhi 7 46 yes 53 2 Bhavesh 5 NA yes NA 3 Chaman 9 NA no NA 4 Dimri 16 69 no 85
范例2:
# R program to add new variables
# in a data frame
# Loading library
library(dplyr)
# Create a data frame
d <- data.frame( name = c("Abhi", "Bhavesh", "Chaman", "Dimri"),
age = c(7, 5, 9, 16),
ht = c(46, NA, NA, 69),
school = c("yes", "yes", "no", "no") )
# Calculating a variable x3 which is product of height
# and age printing with ht and age
mutate(d, x3 = ht * age)
输出:
name age ht school x3 1 Abhi 7 46 yes 322 2 Bhavesh 5 NA yes NA 3 Chaman 9 NA no NA 4 Dimri 16 69 no 1104
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注:本文由纯净天空筛选整理自nidhi_biet大神的英文原创作品 Add new Variables to a Data Frame using Existing Variables in R Programming – mutate() 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。