How to sort two lists? Sort distance

[Didier Lachieze]

(12-03-2019 10:24 AM)ailoher Wrote:  What I would need is to sort the elements from a list with respect to their distance to an element outside the list. Is there any way to do so?

Here is a CAS program that should do what you want, if I've correctly understood it:

Code:

#cas
sortd(li,ref):=
BEGIN
 return sort(li,(x,y)->abs(x-ref)<abs(y-ref));
END;
#end

sortd({2,3,6,8,5,9},5) returns {5,6,3,2,8,9}