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Re: Sudoku

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On Saturday, March 30, 2013 8:41:08 AM UTC+10:30, Dave Angel wrote:
> On 03/29/2013 05:47 PM, Eric Parry wrote:
> 
> >
> 
> >>   <SNIP>
> 
> >>
> 
> > That explains why the program keeps running after a solution is found.
> 
> 
> 
> A recursive function can be designed to find all solutions, in which 
> 
> case it would (as you say) keep running.
> 
> 
> 
> The function you posted in the first place uses exit() to avoid keeping 
> 
> running.  It stops as soon as a solution is found.
> 
> 
> 
> Sometimes a problem cannot be solved in the number of stack entries 
> 
> supplied by Python.  So even though such a function will terminate, it 
> 
> may crash first if the problem is too big.  Example, the factorial 
> 
> problem I described earlier, if you pass it 2000 as a parameter.  If 
> 
> this is a problem, one can tell the Python to give you more stack entries.
> 
> 
> 
> Given a 9x9 matrix, and at least some of them filled in, the maximum 
> 
> depth your code can use is less than 81.  So it won't get a stack 
> 
> overflow in any implementation of Python I've seen.  Perhaps in an 8051.
> 
> 
> 
> Sometimes a bug in such a function will cause it to run indefinitely, 
> 
> and/or to overflow the stack.  I don't see such a bug in this function.
> 
> 
> 
> 
> 
> -- 
> 
> DaveA

The exit() did not work.
I replaced it with return = 0, and that does work.
Eric.

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Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-26 22:44 -0700
  Re: Sudoku Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2013-03-27 08:58 +0100
    Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-27 20:00 -0700
      Re: Sudoku Dave Angel <davea@davea.name> - 2013-03-28 00:36 -0400
        Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-28 15:11 -0700
          Re: Sudoku Dave Angel <davea@davea.name> - 2013-03-28 19:28 -0400
            Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-28 22:07 -0700
            Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-28 22:07 -0700
          Re: Sudoku Chris Angelico <rosuav@gmail.com> - 2013-03-29 09:45 +1100
            Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-29 14:47 -0700
              Re: Sudoku Dave Angel <davea@davea.name> - 2013-03-29 18:11 -0400
                Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-30 15:06 -0700
                Re: Sudoku Dave Angel <davea@davea.name> - 2013-03-30 19:15 -0400
                Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-31 15:03 -0700
                Re: Sudoku Dave Angel <davea@davea.name> - 2013-03-31 18:34 -0400
                Re: Sudoku Arnaud Delobelle <arnodel@gmail.com> - 2013-03-31 23:59 +0100
                Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-31 15:03 -0700
                Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-31 15:27 -0700
                Re: Sudoku Chris Angelico <rosuav@gmail.com> - 2013-04-01 09:35 +1100
                Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-31 20:58 -0700
                Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-31 15:27 -0700
                Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-30 15:06 -0700
            Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-29 14:47 -0700
        Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-28 15:11 -0700
  Re: Sudoku Damien Wyart <damien.wyart@free.fr> - 2013-03-27 09:49 +0100
  Re: Sudoku Dave Angel <davea@davea.name> - 2013-03-27 05:38 -0400
  Re: Sudoku Eric Parry <joan4eric@gmail.com> - 2013-03-27 19:49 -0700

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