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Re: Question with 'at' operator

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here is "at" operator's meaning below:

at
• The at operator can access a solution to a time-dependent problem at any time. COMSOL provides the solution at that time using interpolation.

• The first input argument is the time. The second input argument is the expression that you want to evaluate using this solution. For example, at(12.5,u) is the solution at 12.5 s.

• The at operator can only be used during results evaluation, so it should not be used when setting up the model.

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