Scientific Computing- Matlab

This is my code for Gauss_Siedel but I this it isn't working because my matrix isn't SDD. How do I make it SDD?

Homework #3 Due Wednesday March 1st 2017 at class time Please plan on submitting on time, otherwise there will be a 25% penalty upfront as well as each missed day unless you have an University excuse. #1 Reading assignment: read pages 31-39 and 41-49 in the textbook to prepare yourselves for the computational work below. #2 Solve, using a MATLAB code, the following system: 5y 22 2z y 52 10 Use both the Gauss-Seidel and the Jacobi methods, with a tolerance of 10 G for the norm of the residual. Arrange your results in a table of the form iteration x y z 0 0 0 that you can see how z, y, progress with each iteration. You can create such a table using disp() in a loop; you may also use printf if you are familiar with it, but do not use the Matlab table command as it does not do quite what is expected here. Also, as obvious from the table above, start with the zero guess. Turn in your code and the output as described