R语言中条件表达语句ifelse语句

001、

a = 10
b = 5
ifelse(test = a > b, yes = a - b, no = b - a)         ## 如果test为真， 则表达式返回yes的值， 否则返回no的值

002、

a = 10
b = 50
ifelse(test = a > b, yes = a - b, no = b - a)         ## 如果test为真， 则表达式返回yes的值， 否则返回no的值