I am reading Mr Cleve Moler's book about Matrix Experiments,
in chapter 18 there is sudoku.m
that automates 9x9 sudokus. Just starting the exercises, one of the questions is to count how long does it take to solve different sudokus.
I would like to count the amount of times that sudoku.m calls itself, I have tried to modify
X=sudoku(X,..) to [X,counter2]=sudoku(X,..,counter1)
but all my attempts return errors like counter2 not updated or too many inputs.
The attached function completes solving the sudoku but I don't know how to implement a counter of the times sudoku.m recurs.
Thanks for time and attention