我的数据框中有超过10,000个测试分数计算错误。它们看起来像这样:
Student Computed Score
1 71.00
2 55.3489
3 2000.11111
4 1689.66
我想将它们四舍五入到最接近的'10'(变量1:71 = 70,1689.66 = 1690),并且最接近'100'(变量2:71 = 100,1689.66 = 1700)。因为原始值是以10点增量和100点分界计算的。我试过了:
df$Var1<-round(df$Computed_Score, 2)
但它将小数位四舍五入为2个值(2000.11111变为2000.11,这没有帮助)。
答案 0 :(得分:4)
以下可能会这样做。
x <- scan(text = "
71.00
55.3489
2000.11111
1689.66")
x
round_to <- function(x, to = 10) round(x/to)*to
round_to(x)
round_to(x, 100)
修改。
用户ORStudent comment后我写了一个新函数roundup_to
。
roundup_to <- function(x, to = 10, up = FALSE){
if(up) round(.Machine$double.eps^0.5 + x/to)*to else round(x/to)*to
}
roundup_to(c(150, 116350), to = 100)
# [1] 200 116400
roundup_to(c(150, 116350), to = 100, up = TRUE)
# [1] 200 116400
roundup_to(c(50, 116250), to = 100)
#[1] 0 116200
roundup_to(c(50, 116250), to = 100, up = TRUE)
#[1] 100 116300