SimBiology error with e^time in reaction rate

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Colin Cess 2017-9-14

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评论： Colin Cess 2017-9-17

I've got a pretty complicated differential equation to describe absorption from a dosing site to the central compartment, part of which contains the term e^(-ka*Time). I've tried using it in the reaction rate itself (as exp(-ka*Time)) and as a rate rule, but I've been getting errors, either that SimBiology can't perform dimensional analysis due to the exp(), or that it can't evaluate the reaction rate at t=0.0000. Is there a way I can get SimBiology to use this term in my reaction rate?

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Answer 1

Arthur Goldsipe 2017-9-14

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Hi,

The message about being unable to perform dimensional analysis is a warning, not an error. Your simulation results should be fine. You just need to manually check your units in the rule and make sure that the argument of exp is dimensionless. See the "Tip" on the reference page for DimensionalAnalysis.

I'm not sure what you mean by "it can't evaluate the reaction rate at t=0.0000". Can you provide more details, such as the exact error message and some sort of reproduction steps? Ideally, if you can attach your model to the question that would make it easier for us to help you.

-Arthur