# sum

Sums up the elements within the input `A`, along the dimension
`d` (if `d` is given).

## Syntax

R = sum(A)

R = sum(A,dim)

## Inputs

`A`- The argument to be summed.
`dim`- The dimension on which to sum.

## Outputs

- R
- The sum of elements for each vector.

## 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
```