Use optimization variable in a function in a constraint

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Joel Baltes 2022-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/1715980-use-optimization-variable-in-a-function-in-a-constraint

评论： Matt J 2023-10-12

Hello :)

While trying to work around the problem-based solver for an optimization problem Im working on, I encountered the error "Unable to perform assignment because value of type 'optim.problemdef.OptimizationExpression' is not convertible to 'double'." I am trying to use an external self-written function, which uses two of my optimization variables as variables, and we need the output of the external function for the constraint value.

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Matt J 2023-10-12

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Answer 1

Rohit Kulkarni 2023-10-12

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Hi Joel,

I understand you are getting the error "Unable to perform assignment because value of type 'optim.problemdef.OptimizationExpression' is not convertible to 'double'." while working on an optimisation problem.

Often, this error comes from an improper initialization of an optimization expression.

Please refer to the documentation provided below for the detailed explanation and examples for resolving this error:

https://in.mathworks.com/help/optim/ug/initialize-optimization-expressions.html

Hope it helps!