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i have two tuples select done with modulo on a range {-1,1} :

Select[Tuples[Range[-1, 1], 3], Mod[Total[#], 1] == 0 &]

and

Select[Tuples[Range[-1, 1], 3], Mod[Total[#], 2] == 0 &]

these generates coordinates for centers of spheres .

I am trying to filter the first select (mod 1) to remove the result of the second select (mod 2) from it in order to remove the coordinates that match in the two select from the final result.

How can it be achieved ?

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  • $\begingroup$ Related $\endgroup$
    – Stitch
    Jan 23, 2017 at 22:24

1 Answer 1

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ClearAll[f, g]
f = Select[Tuples[Range[-1, 1], 3], Mod[Total[#], 1] == 0 &]
g = Select[Tuples[Range[-1, 1], 3], Mod[Total[#], 2] == 0 &]

If we want to delete g from f:

DeleteCases[f, Alternatives @@ g]

Fold[Cases[#1, Except@#2] &,f,g]
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    $\begingroup$ Complement[f, g] is way more compact. $\endgroup$ Jan 24, 2017 at 2:41
  • $\begingroup$ @J.M. Absolutely! $\endgroup$
    – Stitch
    Jan 24, 2017 at 2:42

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