# Analyzing Data

A core feature of Iris DVA is the ability to create custom analysis functions and tune input arguments from the Analysis interface and store output arguments in a user-defined location. Furthermore, Iris DVA introduces a way to provide mutable default values for specific function input arguments. To take full advantage of the Analysis feature in Iris DVA, one must understand the creation and access processes of function files in MATLAB. Below is a short list of resources we assume the user comprehends.

* [Creating Function Files](https://www.mathworks.com/help/matlab/matlab_prog/create-functions-in-files.html)
* [Functions](https://www.mathworks.com/help/matlab/ref/function.html)
* [Types of Functions](https://www.mathworks.com/help/matlab/matlab_prog/types-of-functions.html)
* [Function Precedence Order](https://www.mathworks.com/help/matlab/matlab_prog/function-precedence-order.html)

Iris DVA leverages the capability of MATLAB's `function` syntax by parsing the function output arguments as named variables and storing them in the specified output mat-file.

```
function [output] = functionName(inputs)
  % ... perform analysis
end
```