/usr/share/octave/packages/secs2d-0.0.8/Utilities/Udriftdiffusion2.m is in octave-secs2d 0.0.8-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | function c=Udriftdiffusion2(mesh,Dsides,guess,M,U,V,Vth,u)
%%
% c=Udriftdiffusion(mesh,Dsides,guess,M,U,V,Vth,u)
% solves the drift diffusion equation
% $ -div ( u ( \nabla (n Vth) - n \nabla V)) + M = U $
%%
% 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/>.
global DDG_RHS DDG_MASS %DEBUG_SGM
Nnodes = max(size(mesh.p));
Nelements = max(size(mesh.t));
% Set list of nodes with Dirichelet BCs
Dnodes=Unodesonside(mesh,Dsides);
% Set values of Dirichelet BCs
Bc = guess(Dnodes);
% Set list of nodes without Dirichelet BCs
Varnodes = setdiff([1:Nnodes],Dnodes);
% Build LHS matrix and RHS
A = Uscharfettergummel2(mesh,V,u,Vth);
if (isempty(DDG_MASS))
DDG_MASS=Ucompmass2(mesh,ones(Nnodes,1),ones(Nelements,1));
end
A = A + DDG_MASS.*spdiag(M,0);
if (isempty(DDG_RHS))
DDG_RHS=Ucompconst(mesh,ones(Nnodes,1),ones(Nelements,1));
end
b = DDG_RHS.*U;
%%%%%%%%DEBUG%%%%%%%%%%%
%DEBUG_SGM = A;
%% Apply boundary conditions
A (Dnodes,:) = 0;
b (Dnodes) = 0;
b = b - A (:,Dnodes) * Bc;
A(Dnodes,:)= [];
A(:,Dnodes)= [];
b(Dnodes) = [];
c = guess;
c(Varnodes) = A \ b;
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