# accumarray

Array accumulation.

## Syntax

A = accumarray(indx,vals)

A = accumarray(indx,vals,sz,func)

A = accumarray(indx,vals,sz,func)

A = accumarray(indx,vals,sz,func,fillval)

## Inputs

`indx`- The array of indices, with one element specified per row. Repeated rows indicate
elements to be accumulated. The dimensions of
`A`are the maximum index in each column, unless`sz`is used. `vals`- The values corresponding to the rows of
`indx`. `sz`- The dimensions of
`A`. The dimensions must be at least as large as specified by`indx`, but no new dimensions can be introduced. (Default: []) `func`- The handle for the function that operates on the accumulated elements. Using [] defaults to @sum. The function must take a vector input and return a single value.
`fillval`- The value to be assigned to elements of
`A`that are not specified by`indx`. (Default: 0)

## Outputs

`A`- The accumulated result.

## Example

`A = accumarray([1,2;2,4;2,1;3,5;2,4], [7,3,4,5,9])`

```
A = [Matrix] 3 x 5
0 7 0 0 0
4 0 0 12 0
0 0 0 0 5
```