NetLogo allows users to write new commands and reporters in Java and other languages and use them in their models. This section of the User Manual introduces this facility and shows how to use an extension in your model once you have obtained or made one.
Extensions created by members of the NetLogo community are available from https://github.com/NetLogo/NetLogo/wiki/Extensions.
For information on creating your own extensions, go here.
To use an extension in a model, add the
extensions keyword at the beginning of the Code tab, before declaring any
breeds or variables.
extensions comes a list of extension names in square brackets. For
extensions [sound speech]
extensions tells NetLogo to find and open the specified extension and
makes the custom commands and reporters found in the extension available to the
current model. You can use these commands and reporters just as if they were
built-in NetLogo primitives.
NetLogo will look for extensions in several places:
C:\Program Files\NetLogo 6.0.3\app\extensions
C:\Program Files (x86)\NetLogo 6.0.3\app\extensions
app/extensionssubdirectory of the NetLogo directory extracted from the installation
Each NetLogo extension consists of a folder with the same name as the extension,
entirely in lower case. This folder must contain a JAR file with the same name
as the folder. For example, the
sound extension is stored in a folder called
sound with a file inside called
To install a NetLogo extension for use by any model, put the extension’s folder in the NetLogo extensions directory. Or, you can just keep the extension’s folder in the same folder as the model that uses it.
Some extensions depend on additional files. These files will be in the extension’s folder along with the JAR file. The folder may also contain other files such as documentation and example models.