gi_scale_vec option

Question

Hi, I'm trying to define heterogeneous conductivity on a monodomain model (no extracellular domain; no bath). I've seen there is the option -gi_scale_vec that allows us to adjust the conductivities elementwise.

I have the following questions about this option:

• Does this define the conductivity value? Or a scalar map that multiplies the conductivity?
• If it is a scalar map, How can I define the reference conductivity? e.g., can I use the g_regions and gi_scale_vec together?
• Is it possible to change also the anisotropy using scale_vec? Or this scales the longitudinal and transverse conductivities by the same value?

Thanks

Kind Regards,

Cesare

Answer 1

Hi!

Yes, you are intended to use gregions together with the scale_vec, since they are combined multiplicatively. This still allows you to set the values with the scale vec, as the other factor can be a constant 1.

Currently, we are scaling all directions by the same value (feedback on that is appreciated). Expanding that to 3 dpn would be trivial on the simulator side, but would make the generation of the scaling field more complicated.

Best, Aurel

Comments

Hi Aurel,

Bumping this old question as it would indeed be very useful for my present application to be able to scale each conductivity (longitudinal, transverse, and sheet) independently with something like a 3 column gi_scale_vec (or gi_scale_mat as the case may be).
Is there any chance of this being added soon or some similar behaviour being added?