Matlab/Scilab Items

The following programs in Matlab and Scilab can be used to illustrate matrix functions and programming techniques. (I created the Enigma example for use in Engineering Analysis 1 at Northwestern University. The Sudoku example for generating these matrices is somewhat more involved but can be a larger project or just used as programming illustration.)

Enigma simulation: Descriptions of this encryption device are available in many places, e.g., Wikipedia at http://en.wikipedia.org/wiki/Enigma_machine . The simulator here uses the full ascii character set (instead of just letters as in the original). Some background appears in the presentation: enigmamatlab.pdf. The code is enigma.m.

Sudoku generation/solution: These files solve and generate Sudoku 9x9 puzzles and solutions as 9x9 matrices. The solver uses row-column-entry format as input. (A converter to go from full matrix to row-column-entry format is also linked here.)

- sudokugen.m: generates puzzles (and solution as 2^nd output argument);

- sudokusol.m: solves puzzle;

- sudokutran.m: converts 9x9 matrix to non-zero row-column-entry format;

- sudokuformatexample.xls: Excel format for printing puzzle;

- sudokugen2.sci, sudokusol2.sci, sudokutran.sci: translated codes in Scilab.