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Thread: [RESOLVED] Very simple sequence problem

  1. Jul 11th, 2005, 09:48 AM #1
    wossname
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    Resolved [RESOLVED] Very simple sequence problem

    Given the input sequence 1,2,3,4,5,6,7,8,9........

    how do you convert it to 2,1,0,2,1,0,2,1,0.........

    All I have at the moment is this:

    Output = (3-(Input mod 3)) mod 3

    Which does work but it looks a bit clumsy, anyone know a better way?
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  2. Jul 11th, 2005, 03:49 PM #2
    opus
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    Re: Very simple sequence problem

    Yes, its clumsy
    I'd use
    Output = 3-(Input mod 3)
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  3. Jul 12th, 2005, 05:06 AM #3
    wossname
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    Re: Very simple sequence problem

    Despite the fact it doesn't work?

    if input is 0 then your version will output (3-0 = 3) there are no threes in my desired sequence, hence the extra mod.
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  4. Jul 12th, 2005, 04:29 PM #4
    zaza
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    Re: [RESOLVED] Very simple sequence problem

    Don't reckon you'll find a better way, my furry friend. It's a repeating sequence, so there's no 1 to 1 correspondence between the first and second sequences. It does, however, repeat with a period of 3 and the obvious (natural) way to do this is to do a "mod". It's in inverse order, so you need a "3 - ". And if you want to use 0 rather than 3, you need to "mod" it again. Three transformations, three operations. Couldn't be easier.

    Obviously you knew this, so I don't know why I'm bothering.


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  6. Jul 24th, 2005, 03:37 AM #5
    bao_ho
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    Re: [RESOLVED] Very simple sequence problem

    <head>
    <script>
    for(x=1;x<15;x++) document.write(2-((x+2)%3));
    </script>
    </head>
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