# How to Sum List Items in R (2 Examples)

In this R tutorial you’ll learn how to sum list elements.

## Example Data

x <- list(c(7, 3, 8), # Constructing list in R c(8, 3, 6), 9:7) x # [[1]] # [1] 7 3 8 # # [[2]] # [1] 8 3 6 # # [[3]] # [1] 9 8 7 |

x <- list(c(7, 3, 8), # Constructing list in R c(8, 3, 6), 9:7) x # [[1]] # [1] 7 3 8 # # [[2]] # [1] 8 3 6 # # [[3]] # [1] 9 8 7

## Example 1: Get Sum Within List Item

sapply(x, sum) # Using sapply function # [1] 18 17 24 |

sapply(x, sum) # Using sapply function # [1] 18 17 24

## Example 2: Get Sum Between Different List Items

Reduce("+", x) # Using Reduce function # [1] 24 14 21 |

Reduce("+", x) # Using Reduce function # [1] 24 14 21

## Related Tutorials & Further Resources

You may find some related R tutorials on topics such as loops, extracting data, and lists in the following list: