Please help with providing a correct code for MATLAB (or Octave)on a tri-diagonal Gaussian elimination .

I have tried several different codes, but no outcome. If you can , please provide the code and run it. thank you a lot .

Write your own code for tri-diagonal Gaussian elimination. Your input should be a random strictly diagonally dominant matrix of size n., and a random right hand side vector. Test your run times for n = 10 * k, k = 1, , 15. Compare them with the rune times of the standard solver in Matlab. Submit a table with run times comparison and your code