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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