# Compare Two Vectors For Equality in R

Vectors are used to store one-dimensional data of the same type in R. In this tutorial, we will look at how to compare two vectors for equality in R with the help of some examples.

## How to check if two vectors are equal in R?

You can use the `identical()` function in R to compare two vectors for equality. Pass the two vectors as arguments to the `indentical()` function.

The following is the syntax –

`identical(vec1, vec2)`

It returns `TRUE` if both vectors contain the same elements in the same positions. That is, the corresponding elements in both vectors are the same.

Alternatively, you can use a combination of the `all()` function and the equality operator to check whether the two vectors are equal or not. The following is the syntax –

`all(vec1 == vec2)`

Let’s now look at some examples of using the above methods to check two vectors for equality.

## Compare two vectors for equality using the `identical()` function

Let’s create two vectors containing the same values at the same positions and check whether they are equal or not using the `identical()` function.

```# create two vector
vec1 <- c(1, 2, 3, 4)
vec2 <- c(1, 2, 3, 4)
# check if both vectors are equal
print(identical(vec1, vec2))```

Output:

` TRUE`

We get `TRUE` as the output since both vectors are equal.

Let’s now apply the `identical()` function on two vectors that are not equal.

```# create two vector
vec1 <- c(1, 2, 3, 4)
vec2 <- c(1, 3, 3, 4)
# check if both vectors are equal
print(identical(vec1, vec2))```

Output:

` FALSE`

We get `FALSE` as the output.

## Compare two vectors for equality using the `all()` function and the `==` operator

You can also use a combination of the R `all()` function and the equality operator `==` to check whether two vectors are equal or not.

First, use the `==` operator to compare the two vectors, this will result in a logical vector with `TRUE` for values that are equal and `FALSE` for values that are not equal.

```# create two vector
vec1 <- c(1, 2, 3, 4)
vec2 <- c(1, 2, 3, 4)
# compare vec1 and vec2
print(vec1 == vec2)```

Output:

` TRUE TRUE TRUE TRUE`

If all the values in the resulting logical vector are `TRUE` then we can say that both the vectors are equal. You can do so using the R `all()` function which returns `TRUE` only if all the values in the passed logical vector are `TRUE`.

```# check if both vectors are equal
print(all(vec1 == vec2))```

Output:

` TRUE`

Thus, a combination of the equality operator, `==` and the `all()` function can tell whether two vectors are equal.

Let’s look at another example.

```# create two vector
vec1 <- c(1, 2, 3, 4)
vec2 <- c(1, 3, 3, 4)
# check if both vectors are equal
print(all(vec1 == vec2))```

Output:

` FALSE`

We get FALSE as the output since the two vectors are not equal.

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