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flip the sign of a variable

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I am running a time dependent simulation and I want to change the sign of a variable when a certain event occurs. I have defined a variable called u and I need to be able to make the statement u=-u. I have tried many variations of this: u=if(event, -u,u) but this gives a circular dependency error. I have also tried adding 'withsol' to this statement but that does not work either. Does anyone know how I might accomplish this?


0 Replies Last Post Feb 28, 2019, 1:52 p.m. EST
COMSOL Moderator

Hello John Baker

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