Data Envelopment Analysis Toolbox and a Working Paper explaining how it works are available to download:

Journal of Statistical Software paper:

A Data Envelopment Analysis Toolbox for MATLAB (JSS Paper) [Download]

Data Envelopment Analysis Toolbox:
The source code and all the examples are available to download from the following repository on GitHub:

The most recent version of the toolbox can be downloaded from the repository by clicking the “Download ZIP” button on the right, or clicking here