Comparison of elements of a vector

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Staff need a function to check that all vector coordinates are equal. 

a = rep(1, 5)

Let the previous output be TRUE.

b = c(rep(1, 4),2)

Let the previous output be FALSE.

r

2 answers

1

I get it,

all(a[1] == a)

and

all(b[1] == b)

1

Complementing Wagner’s answer. It’s correct, but it doesn’t work if the vectors contain values NA.

> a = rep(NA, 5)
> all(a[1] == a)
[1] NA
> b = c(rep(1, 4),NA)
> all(b[1] == b)
[1] NA

In this case you could use the following comparisons:

> isTRUE(all.equal(rep(a[1], length(a)), a))
[1] TRUE
> isTRUE(all.equal(rep(b[1], length(b)), b))
[1] FALSE

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