Togaware DATA MINING
Desktop Survival Guide
by Graham Williams
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Sudoku

Solve a sudoku puzzle with the sudoku package! Into a file place the following representation of a sudoku puzzle:

2--f-c-8----ab7-
e---a-6-f-03--d-
--305b-f--2496--
-7------b---5-f1
-------e9-d----6
-0fec-89-----1-b
6----532--7--9-8
-9--d--0----7a4-
-6dc----3--7--a-
7-0--e--46b----9
1-e-----5d-9fc3-
4----3-ae-------
93-1---c------e-
--72e4--8-6dbf--
-e--8a-3-1-5---c
-a45----7-9-8--0

Then:

> install.packages("sudoku")
> library(sudoku)
> library(help=sudoku)
> sud <- readSudoku("sudoku.txt")
> solveSudoku("sudoku.txt", map=c(0:9,letters))
2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13]
 [1,]    2    4    6    f    0    c    e    8    d     9     5     1     a
 [2,]    e    b    5    9    a    1    6    7    f     8     0     3     c
 [3,]    c    1    3    0    5    b    d    f    a     7     2     4     9
 [4,]    8    7    a    d    3    9    2    4    b     e     c     6     5
 [5,]    5    8    1    7    4    f    a    e    9     b     d     0     3
 [6,]    a    0    f    e    c    7    8    9    6     4     3     2     d
 [7,]    6    d    c    4    b    5    3    2    1     a     7     f     e
 [8,]    3    9    2    b    d    6    1    0    c     5     e     8     7
 [9,]    b    6    d    c    9    8    4    1    3     2     f     7     0
[10,]    7    5    0    3    f    e    c    d    4     6     b     a     1
[11,]    1    2    e    a    7    0    b    6    5     d     8     9     f
[12,]    4    f    9    8    2    3    5    a    e     0     1     c     6
[13,]    9    3    8    1    6    d    0    c    2     f     a     b     4
[14,]    0    c    7    2    e    4    9    5    8     3     6     d     b
[15,]    f    e    b    6    8    a    7    3    0     1     4     5     2
[16,]    d    a    4    5    1    2    f    b    7     c     9     e     8
      [,14] [,15] [,16]
 [1,]     b     7     3
 [2,]     4     d     2
 [3,]     6     8     e
 [4,]     0     f     1
 [5,]     2     c     6
 [6,]     1     5     b
 [7,]     9     0     8
 [8,]     a     4     f
 [9,]     e     a     5
[10,]     8     2     9
[11,]     c     3     4
[12,]     7     b     d
[13,]     5     e     7
[14,]     f     1     a
[15,]     d     9     c
[16,]     3     6     0

Another one. The original pattern is:

+-------+-------+-------+
| 1 . . | . . 7 | . 9 . |
| . 3 . | . 2 . | . . 8 |
| . . 9 | 6 . . | 5 . . |
+-------+-------+-------+
| . . 5 | 3 . . | 9 . . |
| . 1 . | . 8 . | . . 2 |
| 6 . . | . . 4 | . . . |
+-------+-------+-------+
| 3 . . | . . . | . 1 . |
| . 4 . | . . . | . . 7 |
| . . 7 | . . . | 3 . . |
+-------+-------+-------+

As a text file for R:

1----7-9-
-3--2---8
--96--5--
--53--9--
-1--8---2
6----4---
3------1-
-4------7
--7---3--

And the solution!

> z <- readSudoku("sudoku2.txt")
> z
      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
 [1,]    1    0    0    0    0    7    0    9    0
 [2,]    0    3    0    0    2    0    0    0    8
 [3,]    0    0    9    6    0    0    5    0    0
 [4,]    0    0    5    3    0    0    9    0    0
 [5,]    0    1    0    0    8    0    0    0    2
 [6,]    6    0    0    0    0    4    0    0    0
 [7,]    3    0    0    0    0    0    0    1    0
 [8,]    0    4    0    0    0    0    0    0    7
 [9,]    0    0    7    0    0    0    3    0    0
> solveSudoku(z)
      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
 [1,]    1    6    2    8    5    7    4    9    3
 [2,]    5    3    4    1    2    9    6    7    8
 [3,]    7    8    9    6    4    3    5    2    1
 [4,]    4    7    5    3    1    2    9    8    6
 [5,]    9    1    3    5    8    6    7    4    2
 [6,]    6    2    8    7    9    4    1    3    5
 [7,]    3    5    6    4    7    8    2    1    9
 [8,]    2    4    1    9    3    5    8    6    7
 [9,]    8    9    7    2    6    1    3    5    4



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