Hi Riccardo,

On 01/05/2012 08:43 PM, Riccardo Rurali wrote:

As far as I've understood if you have 2 you are sure things are ok, but having 3 does not 
mean things are wrong. I think (again, as far as I've understood) that if you have 2 the 
matrix is strictly tridiagonal and certain numerical routine can be used to do the 
"Green functions stuff". If you have 3 the matrix is strictly not tridiagonal, 
but this could simply mean that you have a few 0.000001 where you are supposed to have 
0.0000. If you manage to converge numercially your results this should been that the 
tridiagonal routines could do their job is spite of the few 0.00001.
In other words, 2 is a recomendation, not a strcit requirement. Now, 4 seems a 
bit too much...:)

Riccardo

thank you very much for answering.

So it is more a thing of numerical convenience, okay. I'm going to check if the length of the electrode has any influence on T(E) in my setup.


Again, thanks for helping!


David

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