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 Subsubsection 7.1.4.4: The node-data model Up Section 7.1: Optimization Input File Section 7.2: Running a Parameter Optimization 

7.1.5 Constraints Section

The Constrained Levenberg-Marquardt method allows linear constraints on the material parameters. If is the material parameter vector, then the linear constraint is of the form: The coefficients are the inputs of the constraint tag. For example, if the linear constraint is , then the Constraints section would be:
<Constraints>
  <constraint>2, -1, 3</constraint>
</Constraints>
 Subsubsection 7.1.4.4: The node-data model Up Section 7.1: Optimization Input File Section 7.2: Running a Parameter Optimization