# Sensitivity interface at Section Level
Return to Extension of an existing material,cross
section, and element for DDM-based:
The following functions need to be implemented in each section for
sensitivity computation:
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int setParameter(const char **argv, int argc, Parameter ¶m);
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int updateParameter (int parameterID, Information &info);
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int activateParameter(int passedParameterID);
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const Vector& getStressResultantSensitivity(int gradIndex, bool
conditional);
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const Vector& getSectionDeformationSensitivity(int gradIndex);
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const Matrix& getInitialTangentSensitivity(int gradIndex);
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int commitSensitivity(const Vector& sectionDeformationGradient,int
gradIndex, int numGrads);