Numerical Green’s Function
There are simulations where we need to change the excitation of the structure frequently. For example, when we must often change the amplitudes of discrete sources or the direction of arrival of an incident field. In these cases, we can save a lot of time by checking the NGF (Numerical Green’s Function) option in the Settings panel > of the Setup tab.
When a NGF calculation is performed, the LU-decomposed matrix of the system is stored in a file after the first calculation. Then, by reusing this stored matrix, new calculations are performed faster than the first one.
The Matrix Size Threshold option in the Settings panel, which also saves a matrix to the PC’s hard drive to allow us to run large calculations, does not work with the NGF option enabled.