Main Content


Specify nonlinear solver maximum iterations in implicit tau


The MaxIterations property specifies the maximum number of iterations for the nonlinear solver in impltau. It is a property of the SolverOptions object. SolverOptions is a property of the configset object.

The implicit tau solver in SimBiology® software internally uses a nonlinear solver to solve a set of algebraic nonlinear equations at every simulation step. Starting with an initial guess at the solution, the nonlinear solver iteratively tries to find the solution to the algebraic equations. The closer the initial guess is to the solution, the fewer the iterations the nonlinear solver will take before it finds a solution. MaxIterations specifies the maximum number of iterations the nonlinear solver should take before it issues a “failed to converge” error. If you get this error during simulation, try increasing MaxIterations. The default value of MaxIterations is 15.


Applies toObject: SolverOptions
Data typeint
Data values>0. Default is 15.


This example shows how to change MaxIterations settings.

  1. Retrieve the configset object from the modelObj, and change the SolverType to impltau.

    modelObj  = sbiomodel('cell');
    configsetObj = getconfigset(modelObj);
    set(configsetObj, 'SolverType', 'impltau');
  2. Change the MaxIterations to 25.

    set(configsetObj.SolverOptions, 'MaxIterations', 25);
    get(configsetObj.SolverOptions, 'MaxIterations')
    ans =