R: Fast small sums

vsum {rmr2} | R Documentation

## Fast small sums

### Description

Returns the sum of a list of numeric vectors

### Usage

    vsum(x)

### Arguments

`x` |

### Details

Equivalent to `sapply(x, sum)`, it's about 30X faster in some use cases (many small sums). It's often useful in reducers in the vectorized form.

### Value

A numeric vector with the sum of each element of the list provided as argument

### Note

See collocations.R in the examples directory.

### See Also

`mapreduce`

[Package rmr2 version 3.3.1 Index]