How to define a constrained region in 2D for a function?

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Cagas Akalin 2015-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/197299-how-to-define-a-constrained-region-in-2d-for-a-function

编辑： Cagas Akalin 2015-4-11

Hi everyone,

I am trying to find the minimum point of the function by using steepest descent algorithm. When the code stars running, derivatives and variables go to infinity. So, I want to put a constrained region on which my objective function works as it is searching the minimum without exceeding this defined region as a constraint. I think this may work.

The problem is that I do not know how I can add a constrained region on which the code works without exceeding that defined region.

I beg to your immediate help. Thanks