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 2019-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/495091-how-can-i-modify-the-default-options-like-reltol-and-abstol-of-the-pde-solver-when-using-the-pd

评论： Ravi Kumar 2020-2-24

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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Ravi Kumar 2019-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/495091-how-can-i-modify-the-default-options-like-reltol-and-abstol-of-the-pde-solver-when-using-the-pd#answer_405024

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

Regards,

Ravi

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Hitesh Saini 2020-2-19

编辑：Hitesh Saini 2020-2-19

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 2020-2-24

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.

Regards,

Ravi

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