Hi Carlo and thanks for your support. I resolved my problem with these 3 
parameters, now I have to know how can I set the region of my diode:

NSides  = [4];
PSides  = [6];

Dsides   = [ NSides PSides];
SiDsides = Dsides;
Sisides =  [ 1:7 ];


I can't understand how is structured this diode from that parameters. 
Why do Nsides has 4 sides and PSides has 6 sides?
Why Sisides start from 1 to 7? What is the link between them? Maybe all 
semiconductor is divided in 7 region and the regions 4 and 6 are doped 
and 1 2 3 5 7 are intrinsec?

Then there is another mistery:

******************************
x1 = linspace(0,1,20*fx);
x1 = Ln*(1-x1.^pow);

x2 = linspace(0,1,20*fx);
x2 =  Ln+Lp*x2.^pow;

[mesh1.p,mesh1.e,mesh1.t]=Ustructmesh(x1,y,1,[1:4]);
[mesh2.p,mesh2.e,mesh2.t]=Ustructmesh(x2,y,1,[1:4]);

side1=2;
side2=4;

mesh=Ujoinmeshes(mesh1,mesh2,side1,side2);
******************************

Ln and Lp are the length of N and P region. Why x2 is 
[(x2.^pow)*Lp]+Ln?  (sum Ln point to point to Lp vector)
What means side1=2, side2=4?

I don't understand the meaning of all these parameters, for a simple 
diode. This is a representation:

               Ln        Lp
           |---------|---------|

       -   ,---------,---------,
       |   |.........|\\\\\\\\\|
   Td  |   |.........|\\\\\\\\\|
       |   |.........|\\\\\\\\\|
       -   '---------'---------'

Thanks all

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