How do I specify convergence criteria while using PDE Toolbox from a script? (R2017a)

The legacy workflow had properties that could be used in pdenonlin function. How can I set the convergence and Jacobian solution parameters in R2017a?

Answer 1

[Ravi Kumar]

Hi Sarojeet,

You can access same controls in the new workflow as a property of the model. You can directly set them by assigning new values, which would replace the default values.

For example, if you have created a model named, myNonlinerProblem, then you can see the defaults as:

>> myNonlinerProblem.SolverOptions

ans = 

    PDESolverOptions with properties:

      AbsoluteTolerance: 1.000000000000000e-06
      RelativeTolerance: 1.000000000000000e-03
      ResidualTolerance: 1.000000000000000e-04
          MaxIterations: 25
                MinStep: 1.525878906250000e-05
           ResidualNorm: Inf
       ReportStatistics: 'off'

One thing that you could do in legacy and not do in new workflow is setting the Jacobian option, by default the new solver used full-Jacobian.