Sensitivity interface at Element Level

The following functions need to be implemented in each element for sensitivity computation:

int setParameter(const char **argv, int argc, Parameter &param); int updateParameter (int parameterID, Information &info); int activateParameter(int passedParameterID);

const Vector & getResistingForceSensitivity(int gradIndex); int commitSensitivity(int gradIndex, int numGrads);

const Matrix & getInitialStiffSensitivity(int gradIndex); const Matrix & getDampSensitivity(int gradIndex); const Matrix & getMassSensitivity(int gradIndex);