Simbiology, trigger change in reaction rate

Question

Michael 2015-12-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260141-simbiology-trigger-change-in-reaction-rate

回答： Michael 2015-12-13

Hi everyone, this feels like it should be easy, but I can't figure it out.

I have a simple reaction A-->B following a given custom reaction rate. I want to add a delay. Using the event trigger I tried two approaches:

time<1800 B=0
time<1800 Imax=0 (Imax is the reaction rate)

However, in both cases the reaction is evaluated as if nothing ever changed. Any suggestions? What am I missing? (for completeness, in the actual model there are upstream components that funnel into A)

Thanks a lot!

Cheers, Michael

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Answer 1

Michael 2015-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/260141-simbiology-trigger-change-in-reaction-rate#answer_203128

Okay, seemingly it only works the other way round.

set the initial value of a parameter to 0 and then:

time>1800 then parameter=new_value

Furthermore, if you want to conditionally compare a quantity different from time one needs to multiply with another parameter equal to one that has the respective unit.

Example: let the unit of X be 'Molarity', then then the event has to look like this:

X>10000*unit_parameter unit_parameter is a globally defined parameter of value 1 with the unit 'Molarity'