[英]R: how to check if vector elements are the same
> dput(ranks)
structure(c(NA, NA, 2L, 2L, NA, NA, NA, 2L, 1L), .Names = c("LANG1",
"LANG2", "LANG3", "LANG4", "LANG5", "LANG6", "LANG7", "LANG8",
"LANG9"))
> ranks
LANG1 LANG2 LANG3 LANG4 LANG5 LANG6 LANG7 LANG8 LANG9
NA NA 2 2 NA NA NA 2 1
I have a vector with 9 elements in it, and I want to check if all the elements in that vector are the same. 我有一个包含9个元素的向量,我想检查该向量中的所有元素是否相同。 Usually I just use all(ranks == ranks[1])
, but in this case since the first element is an NA
, I don't get a TRUE/FALSE output. 通常我只使用all(ranks == ranks[1])
,但是在这种情况下,因为第一个元素是NA
,所以我不会得到TRUE / FALSE输出。
您可以简单地检查唯一值的数量:
length(unique(ranks)) == 1
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