比较R中的两个向量

Question

I have two vectors: a = c(1,2,3) , b = c(1,2,3)

I want to test whether a is exactly the same as b . I know the result can be given by sum(a == b) == length(a) , but is there any elegant way?

Answer 1

We can use identical

identical(a,b)
#[1] TRUE

Or if we there are some difference in attributes which we need to avoid in the comparison, use all.equal

all.equal(a,b, check.attributes=FALSE)
#[1] TRUE

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Or using similar approach in the OP's post, we can make it compact with all

all(a==b)
#[1] TRUE

The number of characters in the above approach is less...

nchar("identical(a,b)")
#[1] 14
nchar("all(a==b)")
#[1] 9

Answer 2

In addition to the answer above; you could also consider the package 'compare'.

library(compare)
compareEqual(a,b)#TRUE