From Rosetta Code
This is an example of a library. You may see a list of other libraries used on Rosetta Code at Category:Solutions by Library.

Wren-complex is a module which adds complex number and matrix support to the Wren programming language. It consists of 4 classes: Complex, Complexes, CMatrix and CMatrices. The second and fourth of these contain static methods for dealing with lists of Complex and CMatrix objects, respectively.

It is the sixteenth in a series of modules (listed on the language's main page) designed to assist with writing Rosetta Code tasks so the same code does not have to be written or copy/pasted time and time again thereby bloating a task's script code unnecessarily.

To use it you need to copy the source code (in the talk page) to a text file called complex.wren and place this in the same directory as the importing script so the command line interpreter can find it.

As there is a dependency on the Wren-trait module, you also need to copy that (if it is not already present) to the same directory as described here. Unless you are using classes in that module directly, there is no need to import them into your script and the Cloneable class can even be imported via Wren-complex itself.