Writing a custom encoder

Can anyone point me towards material describing how to write a custom encoder?

Is there any doc?
Or is it a matter of hacking the existing code (on a somewhat trial and error basis)?

Thanks,

The BAMI chapter on encoding should have all the info you need from a theory stand point:

For the actual implementation, assuming you are working in Python you should subclass the Encoder class like the other encoders in NuPIC:

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You can also look at several encoders I implemented for my project :

they are very simple and I think you will grasp the logic by simply reading the code.