Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / secs2d-0.0.8 / Utilities / Ufvsgcurrent.m

diff --git a/octave_packages/secs2d-0.0.8/Utilities/Ufvsgcurrent.m b/octave_packages/secs2d-0.0.8/Utilities/Ufvsgcurrent.m
new file mode 100644 (file)
index 0000000..ea43162
--- /dev/null
+++ b/octave_packages/secs2d-0.0.8/Utilities/Ufvsgcurrent.m
@@ -0,0 +1,74 @@
+function [jx,jy]=Ufvsgcurrent(omesh,n,psi,psith,coeffe);
+
+% [jx,jy]=Udrawcurrent(omesh,n,psi,psith,coeffe);
+
+% This file is part of 
+%
+%            SECS2D - A 2-D Drift--Diffusion Semiconductor Device Simulator
+%         -------------------------------------------------------------------
+%            Copyright (C) 2004-2006  Carlo de Falco
+%
+%
+%
+%  SECS2D is free software; you can redistribute it and/or modify
+%  it under the terms of the GNU General Public License as published by
+%  the Free Software Foundation; either version 2 of the License, or
+%  (at your option) any later version.
+%
+%  SECS2D is distributed in the hope that it will be useful,
+%  but WITHOUT ANY WARRANTY; without even the implied warranty of
+%  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+%  GNU General Public License for more details.
+%
+%  You should have received a copy of the GNU General Public License
+%  along with SECS2D; If not, see <http://www.gnu.org/licenses/>.
+
+Nelem = size(omesh.t,2);
+jx = NaN*ones(Nelem,1);
+jy = jx;
+
+for iel=1:Nelem
+
+       K = sum(omesh.wjacdet(:,iel));
+
+       dpsi1 = psi(omesh.t(3,iel))-psi(omesh.t(2,iel));
+       dvth1 = psith(omesh.t(3,iel))-psith(omesh.t(2,iel));
+       vthm1 = Utemplogm(psith(omesh.t(3,iel)),psith(omesh.t(2,iel)));
+       [bp,bn] = Ubern((dpsi1-dvth1)/vthm1);
+       t1    = omesh.p(:,omesh.t(3,iel))-omesh.p(:,omesh.t(2,iel));
+       l1    = norm(t1,2);
+       t1    = t1/l1;
+       j1    = vthm1*(coeffe(iel)/l1) * ( n(omesh.t(3,iel)) * bp - ...
+               n(omesh.t(2,iel)) * bn) * t1;
+
+       gg1= omesh.shg(:,2,iel)'*omesh.shg(:,3,iel)*l1^2;
+
+       dpsi2 = psi(omesh.t(1,iel))-psi(omesh.t(3,iel));
+       dvth2 = psith(omesh.t(1,iel))-psith(omesh.t(3,iel));
+       vthm2 = Utemplogm(psith(omesh.t(1,iel)),psith(omesh.t(3,iel)));
+       [bp,bn] = Ubern((dpsi2-dvth2)/vthm2);
+       t2 = omesh.p(:,omesh.t(1,iel))-omesh.p(:,omesh.t(3,iel));
+       l2 = norm(t2,2);
+       t2 = t2/l2;
+       j2 = vthm2*(coeffe(iel)/l2) * ( n(omesh.t(1,iel)) * bp - ...
+               n(omesh.t(3,iel)) * bn) * t2;
+
+       gg2= omesh.shg(:,1,iel)'*omesh.shg(:,3,iel)*l2^2;
+
+       dpsi3 = psi(omesh.t(2,iel))-psi(omesh.t(1,iel));
+       dvth3 = psith(omesh.t(2,iel))-psith(omesh.t(1,iel));
+       vthm3 = Utemplogm(psith(omesh.t(2,iel)),psith(omesh.t(1,iel)));
+       [bp,bn] = Ubern((dpsi3-dvth3)/vthm3);
+       t3 = omesh.p(:,omesh.t(2,iel))-omesh.p(:,omesh.t(1,iel));
+       l3 = norm(t3,2);
+       t3 = t3/l3;
+       j3 = vthm3*(coeffe(iel)/l3) * ( n(omesh.t(2,iel)) * bp - ...
+               n(omesh.t(1,iel)) * bn) * t3;
+
+       gg3= omesh.shg(:,2,iel)'*omesh.shg(:,1,iel)*l3^2;
+       
+       Jk = j1*gg1+j2*gg2+j3*gg3;
+       jx(iel) = Jk(1);
+       jy(iel) = Jk(2);
+
+end
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