Coordinate number

[Nicolás Marcelo Rozas Castro]

Dears CP2K users 

I have a problem to define my colective variable. I want to define the 
coordination number between an atom and many others in my simulation box, 
but i want to use the summation of this as:

where s, are all the atoms tha i need to consider. so my question is, how 
can i achieve this?

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