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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 2019 年 10 月 19 日
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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