CustomTool functions (median etc.)

I often use the CustomTool but mostly only at the surface of its abilities.

I remember that there once was a nice documentation about what is possible with it and right now I am looking for a median or ranking function for n elements. Does this exist?

EDIT..
I figured it out and here are the lines to copy into the fields of the CustomTool>Channel Tab

MEAN

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(c1+c2+c3)/3

MEDIAN

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if ((c1 <= c2 && c2 <= c3) || (c3 <= c2 && c2 <= c1), c2, if((c2 <= c1 && c1 <= c3) || (c3 <= c1 && c1 <= c2), c1, c3))

It is static and only working for three inputs (elements), but it works inside of one node.

Regards,
Rainer