# Sensitivity interface at Element Level
The following functions need to be implemented in each element for
sensitivity computation:
Return to Extension of an existing material,cross
section, and element for DDM-based:
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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 & getResistingForceSensitivity(int gradIndex);
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int commitSensitivity(int gradIndex, int numGrads);
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const Matrix & getInitialStiffSensitivity(int gradIndex);
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const Matrix & getDampSensitivity(int gradIndex);
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const Matrix & getMassSensitivity(int gradIndex);