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Topic: skipping some i, j , ... values in Table
Replies: 3   Last Post: May 19, 2013 5:46 AM

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Posts: 6
Registered: 12/29/12
Re: skipping some i, j , ... values in Table
Posted: May 19, 2013 5:46 AM
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Others will chime in with more elegant solutions, but I believe this does what you wanted:

f @@@ Select[
Flatten[Table[{i, j}, {i, 1, 10}, {j, 1, 10}],
1], ! PrimeQ@(Plus @@ #) &]

That gives a list of f[i,j] where i+j aren't prime.

On Saturday, May 18, 2013 1:38:24 AM UTC-5, Andre Hautot wrote:
> Hi,
> Suppose I need a list, Flatten[Table[something[i,j],{i,10},{j,10}]],
> where some combinations of indices i and j are voluntarily missing under
> a known condition (for example, stupid I know, when i+j is a prime).
> How can I do that ?
> Thanks in advance,
> ahautot

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