How should this be written?

Error keeps coming up. tried many things

[Stephen23]

You already asked a very similar question, and got an answer that you accepted:

http://www.mathworks.com/matlabcentral/answers/170823-how-is-this-written

Did you learn anything about MATLAB code? Or are we going to do all of your homework for you?

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers Prove that you've tried many things by showing 2 or 3 of them.