SOLVING SUDOKU WITH MATLAB VERIFICATION FUNCTION correctness verification of the puzzle: checks if the current element appears twice in the same line,

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SOLVING SUDOKU WITH MATLAB VERIFICATION FUNCTION correctness verification of the puzzle: checks if the current element appears twice in the same line, column, or in the 3-by-3 grid. Input: the cell matrix A which contains the current puzzle. Output: variable val which can have two values: 0 if the puzzle is correct 1 otherwise function [val]=verific(A)

SOLVING SUDOKU WITH MATLAB ALGORITHM Based on constraint propagation The key internal function is: When a value is assigned to a cell that same value cannot be used as a possible assignment in all related cells; If a cell has only one single value for possible assignment, that value is immediately assigned. % Read predefined games and outputs the solved puzzle function [A]= iSudokuALG(A)

SOLVING SUDOKU WITH MATLAB ALGORITHM Steps: 1. Find all the possible values for all the empty cells; 2. If there is a single possible value, we assign that value to the cell; 3. Propagate constraints to other cells until you reach the end of the puzzle; 4. If all the cells have more than one possible value we fill in a tentative value for that cell. 5. START AGAIN (When do we stop?)

SOLVING SUDOKU WITH MATLAB ALGORITHM When do we stop? When there are no more empty cells in the puzzle; When for a cell we cannot place any possible value.

SOLVING SUDOKU WITH MATLAB ALGORIHM TESTING Experimental results for different Sudoku puzzles: