This is the parent command of a number of subcommands that deal with the calculation of the Jacobian matrix J. The elements of the Jacobian matrix, calculated at the calibration points, are the partial derivatives of the system response with respect to the parameters to be estimated:
The Jacobian matrix discussed here must be distinguished from the one calculated in the simulation program TOUGH2. The latter is used to solve the set of non-linear algebraic iterations arising at each time step; its elements are the partial derivatives of the mass residuals with respect to the primary variables, and its numerical computation is controlled by the TOUGH2 variable DFAC.
>> ...of the JACOBIAN matrix is performed...
>>> ...using FORWARD finite difference quotients for : 3 iterations
before switching to centered finite difference quotients.
>>> Parameter PERTURBation factor is: 1 % (default)