A vector is a one-dimensional data structure used to store data of the same type in R. Numeric vectors are commonly used to store a sequence of numbers. In this tutorial, we will look at how to get the sum of values in an R vector with the help of some examples.

## How to get the sum of values in a vector in R?

You can use the R `sum()`

function to get the sum of values in a vector. Pass the vector as an argument to the function. The following is the syntax –

# sum of values in a vector sum(vec, na.rm=FALSE)

It also takes an additional (optional) argument, `na.rm`

to indicate whether to remove missing values when computing the sum. It is `FALSE`

by default.

The function returns the sum of values in the passed vector.

## Examples

Let’s look at some examples of using the above method to get the sum of values in a vector.

### Sum of values in a numeric vector

Let’s create a vector of numbers (and without any `NA`

values) and apply the `sum()`

function.

# create a vector vec <- c(1, 2, 3) # sum of values in vector sum(vec)

Output:

6

We get the sum as 6, which is the correct sum of the values in the above vector, 1+2+3=6.

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What would happen if there are some `NA`

present values in the vector? Let’s find out. First, we will create a vector with some `NA`

values and then apply the `sum()`

function without any additional arguments.

# create a vector with NA values vec <- c(1, 2, NA, 3, NA) # sum of values in vector sum(vec)

Output:

<NA>

You can see that we get `NA`

as the output. This is because summing anything with `NA`

results in `NA`

in R.

### Sum of values in a vector with `NA`

values

You can pass `TRUE`

to the `na.rm`

parameter of the `sum()`

function to exclude missing values when computing the sum in a vector.

# create a vector with NA values vec <- c(1, 2, NA, 3, NA) # sum of values in vector sum(vec, na.rm=TRUE)

Output:

6

Now we get the sum of values in the above vector as 6.

You might also be interested in –

- Create a Vector in R – With Examples
- R – Get Element by Index in a Vector
- How to Print a Vector in R?
- R – Get the Length of a Vector

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