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July 20th, 2019, 04:26 AM  #1 
Member Joined: Sep 2013 Posts: 93 Thanks: 2  What's wrong with this matlab example?
Hello I'm trying to create an optimization problem in matlab, but I get this error: Error using optim.internal.problemdef.Power Result of operation must be linear or quadratic. Error in .^ Error in ^ Error in rosenbrock_opt (line 2) obj = 100*(x(2)  x(1)^2)^2 + (1  x(1))^2; The matlab code: x = optimvar('x',1,2); obj = 100*(x(2)  x(1)^2)^2 + (1  x(1))^2; prob = optimproblem('Objective',obj); nlcons = x(1)^2 + x(2)^2 <= 1; prob.Constraints.circlecons = nlcons; showproblem(prob) Here is the link, I just copied the lines from the website(Define Problem Using Optimization Variables). https://www.mathworks.com/help/optim...lembased.html 
July 20th, 2019, 08:36 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,637 Thanks: 1472 
obj ends up being quartic in x(1) It looks like optimproblem() wants either linear or quadratic terms. 

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matlab, optimization, wrong 
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