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How can I modify the default options (like RelTol' and 'AbsTol') of the pde solver when using the PDE toolbox?

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Mario Di Salvo
Mario Di Salvo on 5 Dec 2019
Commented: Ravi Kumar on 24 Feb 2020
When working in 1D, I can modify the default options of the solver by using odeset and then calling the 'options' with pdepe, for example:
options = odeset('RelTol',1e-13,'AbsTol',1e-13);
sol = pdepe(m,'pde','ic','bc',x,t,options)
Now I am working in a 2D probelm and I am using the PDE toolbox. How can I especify options when working with the PDE toolbox? I use the command line function solvepde and I I would like to set more strict Relative error tolerance and Absolute error tolerance.
Apparently, the function solvepde calls ode15s which allows the especification of 'options'.
Thank you.


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Accepted Answer

Ravi Kumar
Ravi Kumar on 5 Dec 2019
You can edit those tolerances directly using the model object properties. Say,
model = createpde(...
User model the set RelTol as:
model.SolverOptions.RelativeTolerance = 1E-6


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Ravi Kumar
Ravi Kumar on 16 Dec 2019
There is no option to force NonNegative constraint. Solution is definied by the PDE coefficients BCs, and ICs, if solution exists.
Hitesh Saini
Hitesh Saini on 19 Feb 2020
Can Someone please elaborate the meathod?
i am not getting what is this.
model = createpde(...
this is for model Right?
i mean how can i change the relTol if i am using the equations to get results.
Ravi Kumar
Ravi Kumar on 24 Feb 2020
Post details of your question and what you have tried so far. Quickly: You can set up a model, define the equaion using various coefficients, while soliving you can also assign value of tolerances to be used. Check help and documenation on PDEModel. I would also suggest creating a new post if your question in not related to the one posted here.

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