Matlab Sudoku Row and Column Check

I need to solve a Sudoku puzzle with Matlab and I'm not sure how to check the rows and columns in order to solve the puzzle. I am creating a "Can't be" 9x9x9 matrix to fill in what can't go in each square. So in the 3D section a 0 placeholder indicates the number can be used. My thought is to sum each row and column for 1-9 (so 45) and check for unique values, but I don't know how to do that. I've tried looking at code online, but I don't understand their process. Any help or ideas to checking the rows and columns is greatly appreciated! Thank you!

Here is my code so far for inserting the known puzzle squares into the "Can't Be" matrix:

    function [ cantbe ] = Setcantbe( Sudoku )
cantbe=zeros(9,9,9)
for i=1:9
    for j=1:9
        if Sudoku(i,j)~=0
            a=Sudoku(i,j)
            for k=1:9
                if k~=a
                cantbe(i,j,k)=k
                end
                    if Sudoku(i,j)==0 && k~=j 
                   %And this is where I get stuck in filling the rows and columns that are blank

                    end

            end  
        end
     end
end

Answer 1

[Tushar Sinha]

Hi Katrina

Please refer to the MathWorks newsletter article link below which shows how to solve a Sudoku puzzle using recursive backtracking in MATLAB:

solving-sudoku-with-matlab:

I hope this helps resolve the issue.

Thanks, Tushar