How can I solve the error of {Undefined operator '.^' for input arguments of type 'optim.pro​blemdef.Op​timization​Expression​'}?

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Hi,
I am running a Matlab Optimization Problem example as explained here, using MATLAB R2017b version :
But I receive the folowing error:
Undefined operator '.^' for input arguments of type 'optim.problemdef.OptimizationExpression'.
Can anyone help with a hint about how to solve it?
Thank you!

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Walter Roberson
Walter Roberson am 19 Okt. 2019
You cannot fix that problem in that release. The first release or two of Problem Based Optimization supported only linear problems. Then support for quadratic programming was added if I recall correctly: until that was added, .^ would have produced systems that the solver could not deal with.
I have not checked recently to see if support for higher powers has been added.

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