Vectors are used to store one-dimensional data of the same type in R. In this tutorial, we will look at how to remove the first value from a vector in R with the help of some examples.
How to remove the first value in a Vector in R?
Negative indexing can be used to exclude values using their index from a vector. To remove the first value from a vector in R, you can use the negative index
-1 inside the
 notation. The following is the syntax –
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# remove first value from vector vec <- vec[-1]
Note that using a negative index does not modify the vector in place. It simply filters the vector and returns a copy with the value at the given index removed. To modify the original vector, assign the resulting vector to the original vector variable.
You can similarly remove any value using its index from a vector in R.
Let’s look at some examples of removing the first value from a vector in R.
First, let’s create a vector with four values and remove the first value using the syntax mentioned above.
# create a vector vec <- c(10, 20, 30, 40) # remove the first element vec <- vec[-1] # display the vector print(vec)
 20 30 40
Here, we use negative indexing to remove the value the index 1 (which is the first value in the vector). Note that we re-assign the returned vector to the variable
vec. You can see that the first value from the original vector is not present in the resulting vector.
Let’s look at another example. This time let’s use a vector with named values.
# create a vector vec <- c("a"=10, "b"=20, "c"=30, "d"=40) # remove the first element vec <- vec[-1] # display the vector print(vec)
b c d 20 30 40
You can see that the first value from the original vector was removed.
You might also be interested in –
- R – Remove NA Values from a Vector
- Remove First Value From a List in R
- Append Element to a Vector in R
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