仅当max <= min时，才如何替换（切换）此数据框中每一行的max和min值？
> my_data
year month day max min
1 2019 1 1 20.4 -24.4
2 2019 1 2 12.9 -20.4
3 2019 1 3 -27.1 10.3
4 2019 1 4 -20.8 11.0
5 2019 1 5 -16.2 -8.9
结果应该是这样的：
> my_data
year month day max min
1 2019 1 1 20.4 -24.4
2 2019 1 2 12.9 -20.4
3 2019 1 3 10.3 -27.1
4 2019 1 4 11.0 -20.8
5 2019 1 5 -8.9 -16.2
提前致谢。
一种选择是 pmax/pmin
library(dplyr)
my_data %>%
mutate(maxnew = pmax(max, min), minnew = pmin(max, min)) %>%
select(year, month, day, max = maxnew, min = minnew)
# year month day max min
#1 2019 1 1 20.4 -24.4
#2 2019 1 2 12.9 -20.4
#3 2019 1 3 10.3 -27.1
#4 2019 1 4 11.0 -20.8
#5 2019 1 5 -8.9 -16.2
或紧凑的方式是 base R
nm1 <- c('max', 'min')
my_data[nm1] <- t(apply(my_data[nm1], 1, sort))[, 2:1]
或使用 pmax/pmin
my_data[nm1] <- lapply(list(pmax, pmin), function(f) do.call(f, my_data[nm1]))
my_data <- structure(list(year = c(2019L, 2019L, 2019L, 2019L, 2019L), month = c(1L,
1L, 1L, 1L, 1L), day = 1:5, max = c(20.4, 12.9, -27.1, -20.8,
-16.2), min = c(-24.4, -20.4, 10.3, 11, -8.9)),
class = "data.frame", row.names = c("1",
"2", "3", "4", "5"))
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