How to apply the method of steepest descent in matlab?

How can I apply the method of steepest decent to write a matlab script that uses a while loop within a while loop?

Thanks in advance

[Image Analyst]

How is this later but simpler question any different than your first version http://www.mathworks.com/matlabcentral/answers/182866-how-do-i-apply-the-method-of-steepest-descent-in-matlab, which already has an answer?