如何删除带有“的行”*&引用;在R程序中?
我想删除缺少该值的行。例如,我的数据框如下所示:如何删除带有“的行”*&引用;在R程序中?,r,symbols,R,Symbols,我想删除缺少该值的行。例如,我的数据框如下所示: dat <- data.frame( time = factor(c("Breakfast","Lunch","Lunch","Dinner"), levels=c("Breakfast","Lunch","Dinner")), total_bill = c(12.75,14.89,"*",17.23) ) dat我们可以将子集与一起使用= dat1 <- droplevels(subset(dat, total_bill
dat <- data.frame(
time = factor(c("Breakfast","Lunch","Lunch","Dinner"), levels=c("Breakfast","Lunch","Dinner")),
total_bill = c(12.75,14.89,"*",17.23)
)
dat我们可以将子集
与一起使用=代码>
dat1 <- droplevels(subset(dat, total_bill != "*"))
dat1 <- type.convert(dat1, as.is = TRUE)
sum(dat1$total_bill, na.rm = TRUE)
#[1] 44.87
dat1如果total\u bill
是字符,您可以将其转换为数字,这将自动将所有非字符转换为NA
,并显示警告消息,然后您可以对其执行sum
、mean
或其他数学运算
sum(as.numeric(dat$total_bill),na.rm = TRUE)
#[1] 44.87
如果total\u bill
是系数,则需要使用
sum(as.numeric(as.character(dat$total_bill)),na.rm = TRUE)
是的,它工作了,但是在移除新的数据帧之后,我们如何使用它呢?因为当我处理像sum(dat$total_bill)这样的函数时,它仍然会出错。是的,我投了赞成票,但我的声誉很低:(所以它告诉我:(