function pdemodel
[pde_fig,ax]=pdeinit;
pdetool('appl_cb',2);
set(ax,'DataAspectRatio',[1 1 1]);
set(ax,'PlotBoxAspectRatio',[1.5 1 1]);
set(ax,'XLim',[-1.5 1.5]);
set(ax,'YLim',[-1 1]);
set(ax,'XTickMode','auto');
set(ax,'YTickMode','auto');

% Geometry description:
pdepoly([ -1,...
 1,...
 1,...
 0,...
 0,...
 -1,...
],...
[ -1,...
 -1,...
 1,...
 1,...
 0,...
 0,...
],...
 'P1');
set(findobj(get(pde_fig,'Children'),'Tag','PDEEval'),'String','P1')

% Boundary conditions:
pdetool('changemode',0)
pdesetbd(6,...
'dir',...
2,...
str2mat('1','0','0','1'),...
str2mat('0','0'))
pdesetbd(5,...
'dir',...
2,...
str2mat('1','0','0','1'),...
str2mat('0','0'))
pdesetbd(4,...
'dir',...
2,...
str2mat('1','0','0','1'),...
str2mat('0','0'))
pdesetbd(3,...
'dir',...
2,...
str2mat('1','0','0','1'),...
str2mat('0','0'))
pdesetbd(2,...
'dir',...
2,...
str2mat('1','0','0','1'),...
str2mat('sin(t)*sin(x)*(t<2*pi)','0'))
pdesetbd(1,...
'dir',...
2,...
str2mat('1','0','0','1'),...
str2mat('0','0'))

% Mesh generation:
setappdata(pde_fig,'Hgrad',1.3);
setappdata(pde_fig,'refinemethod','regular');
setappdata(pde_fig,'jiggle',char('on','mean',''));
pdetool('initmesh')

% PDE coefficients:
pdeseteq(3,...
'1.0',...
str2mat('0.0','0.0','0.0','0.0'),...
str2mat('1.0','1.0'),...
str2mat('1.0','0.0','0.0','1.0'),...
'0:.1:10',...
'0.0',...
'0.0',...
'[0 100]')
setappdata(pde_fig,'currparam',...
['1.0';...
'0.0';...
'0.0';...
'0.0';...
'1.0';...
'1.0';...
'0.0';...
'0.0';...
'1.0';...
'0.0';...
'0.0';...
'1.0';...
'0.0';...
'1.0'])

% Solve parameters:
setappdata(pde_fig,'solveparam',...
str2mat('0','1000','10','pdeadworst',...
'0.5','longest','0','1E-4','','fixed','Inf'))

% Plotflags and user data strings:
setappdata(pde_fig,'plotflags',[1 1 1 1 1 1 1 1 0 1 1 101 0 0 1 0 0 1]);
setappdata(pde_fig,'colstring','');
setappdata(pde_fig,'arrowstring','');
setappdata(pde_fig,'deformstring','');
setappdata(pde_fig,'heightstring','');

% Solve PDE:
pdetool('solve')