# sum

Returns vector or matrix element sums.

## Syntax

R = sum(A)

R = sum(A,dim)

## Inputs

`A`- The argument from which to sum elements.
`dim`- The dimension on which to sum, or 'all'.

## Outputs

- R
- The sums of elements.

## Examples

Vector:

`R = sum([1,2,3])`

`R = 6`

Matrix with a specified dimension:

`R = sum([1,2,3; 4 5 6],2)`

```
R = [Matrix] 2 x 1
6
15
```

Matrix with all dimensions:

`R = sum([1,2,3; 4 5 6],'all')`

`R = 21`