# How to use the ceiling() function in R?

In this tutorial, we will look at how to use the built-in ceiling() function in R with the help of some examples.

## What does the `ceiling()` function do in R?

You can use the built-in math function, ceiling() to get the smallest integer greater than or equal to a given number in R. Pass the number for which you want to get the ceiling as an argument to the `ceiling()` function. The following is the syntax –

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`ceiling(x)`

If you pass an integer to the `ceiling()` function, you’ll get the same value as the output. Note that you can apply the `ceiling()` function to a numeric vector, array, matrix, and a dataframe as well.

## Examples

Let’s look at some examples of using the `ceiling()` function in R.

### Apply `ceiling()` function to a number

First, let’s look at some examples of using the `ceiling()` function on a positive real number.

```# ceiling for a positive real number
print(ceiling(3.2))
print(ceiling(3.4))
print(ceiling(3.7))```

Output:

``` 4
 4
 4```

You can see that we get the same output, 4 for the values, 3.2, 3.4, and 3.7. Notice that 4 is the smallest integer that is greater than or equal to the above values and thus we get 4 as the output for all the values in the above example.

Let’s now apply the ceiling function to negative real numbers.

```# ceiling for a negative real number
print(ceiling(-3.2))
print(ceiling(-3.4))
print(ceiling(-3.7))```

Output:

``` -3
 -3
 -3```

We get -3 as the result for the numbers, -3.2, -3.4, and -3.7. Here, -3 is the smallest integer that is greater than or equal to all the passed values.

### Apply `ceiling()` function to a numeric vector

You can similarly apply the `ceiling()` function to a numeric vector in R. If you apply the `ceiling()` function to a numeric vector, it will compute the ceiling for each value in the vector.

Let’s look at an example.

```# ceiling for a numeric vector
vec <- c(0, 1.3, -1.3, 2.5, 3.1)
print(ceiling(vec))```

Output:

`  0  2 -1  3  4`

You can see that we get the ceil (or the ceiling value) for each value in the numeric vector.

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