Returns the given sudoku as a Simple Sudoku format.
str = sudoku_writess ( X ) str = sudoku_writess ( X , filename )
a 9-by-9 matrix, with 0 for unknown entries
a string representing a file
a matrix of 11 x 11 characters, with dots "." for unknowns. The entries come row by row.
Converts a sudoku in human readable format string, where "." represents unknowns. If the input argument filename is present, also writes the string into the file.
http://www.sudocue.net/fileformats.php