# 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.
Type: integer
Dimension: matrix
vals
The values corresponding to the rows of indx.
Type: double | complex
Dimension: vector
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: [])
Type: integer
Dimension: vector
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.
Type: handle
fillval
The value to be assigned to elements of A that are not specified by indx. (Default: 0)
Type: double | complex

## 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