# innerinv

Computes the inner product on down scaled ROI.

## Contents

- Syntax
- Description
- Input Arguments
- Output Arguments
- See Also
- Code

## Syntax

    i = innerinv(x,y,seti)

## Description

`innerinv(x,y,seti)` computes the inner product on the down scaled region of interest from two complex vectors x, y.

## Input Arguments

- x, y : two complex vectors of size seti.nInv^seti.dim (values in region of interest written as a vector).
- seti.dVinv : area/volume of the infinitesimal element (pixel/voxel) of down scaled CD, setGrid.html and especially setGridScale.html.

## Output Arguments

i : inner product on down scaled ROI, see "More About" in innerroi.html, but in this case with .

## See Also

- innerroi.html

## Code

    function i = innerinv(x,y,seti)
    i = (x'*y)*seti.dVinv;
    end