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