integration tolerance has not met

5 views (last 30 days)
Hi
I encountered an issue in implementing the growth rate of the tumor. In the following equation, both tumor carrying capacity and tumor volume are species
(d/dt)TumorVolume = r * TumorVolume * log(TumorCarryingCapacity/TumorVolume)
I received a message error that the integration tolerance has not met. I believe it is because tumor carrying capacity and tumor volume are species and they have to be that.
How would I solve this?
Appreciate your help

Accepted Answer

Arthur Goldsipe
Arthur Goldsipe on 17 Apr 2025
If you can share your model or other reproduction steps, then we can likely offer better advice. In the absence of those details, one thing I notice is that the rate equation you provide could easily result in non-finite values. For example, if TumorCarryingCapacity is ever 0, then the log term will be -inf (assuming a positive, finite value for TumorVolume). If r or TumorVolume is also 0 at the same time, then the rate will be NaN.
You could use the SimBiology Model Debugger to step through your simulations to see if non-finite values appear and determine what their source is.

More Answers (0)

Categories

Find more on Scan Parameter Ranges in Help Center and File Exchange

Products


Release

R2024a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!