If I have a list of interger, and I gave them string names, how do i get the name based on the value?
如果我有一个interger列表,并且我给了它们字符串名称,我如何根据值得到名称?
Is that possible?
那可能吗?
Thanks
2 个解决方案
#1
x <- list(a=2L,b=3L)
names(x[which(x==2)])
#2
match with names works:
与名称匹配的作品:
x <- list(a=2L,b=3L)
names(x)[match(2L,x)]
# [1] "a"
This also works if x is not actually a list, but a vector: x <- c(a=2L,b=3L).
如果x实际上不是列表,而是向量:x < - c(a = 2L,b = 3L),这也有效。
If the value is not unique, it selects the first match:
如果值不唯一,则选择第一个匹配:
x <- list(a=2L,b=3L,d=2L)
names(x)[match(2L,x)] # still "a"
#1
x <- list(a=2L,b=3L)
names(x[which(x==2)])
#2
match with names works:
与名称匹配的作品:
x <- list(a=2L,b=3L)
names(x)[match(2L,x)]
# [1] "a"
This also works if x is not actually a list, but a vector: x <- c(a=2L,b=3L).
如果x实际上不是列表,而是向量:x < - c(a = 2L,b = 3L),这也有效。
If the value is not unique, it selects the first match:
如果值不唯一,则选择第一个匹配:
x <- list(a=2L,b=3L,d=2L)
names(x)[match(2L,x)] # still "a"