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clear all
global basemesh
global disp
xnod=[0 1 1 0]';ynod=[0,0,1 1]';
nodes=[1 2 3 4];
for i=1:1
        [nodes,xnod,ynod]=refine(nodes,xnod,ynod);
end
hangnode=[]; % No hanging nodes on the first mesh
icase=2; % 1 for volume load, 2 for boundary tractions

[ux,uy]=solve(icase,nodes,xnod,ynod,hangnode);

tol=1e-5;err=1e9;stopp=1;effp=[];iite=0;mite=20;
while(err>stopp & iite < mite)
    iite=iite+1;
        [err,stopp,ellist,eff,epsx,epsy,epsxy]=errcal(icase,ux,uy,nodes,xnod,ynod,hangnode,tol);
        effp=[effp,eff];
        eps=1;
    ppp=epsx.*epsx+epsy.*epsy+epsxy.*epsxy/2;
         figure(1),clf,patch(xnod(nodes')+eps*ux(nodes'),ynod(nodes')+eps*uy(nodes'),'w'),hold on
     plot([0.8,1.5],eps*[disp,disp],'k-'),plot([0.8,0.8],[-0.4,eps*disp],'k-'),drawnow
        if(err     [nodes,xnod,ynod,hangnode]=refine_local(nodes,xnod,ynod,ellist);
        [ux,uy]=solve(icase,nodes,xnod,ynod,hangnode);minuy=min(uy)
end
%figure(2),plot(effp,'-o'),axis([1 length(effp) 0 1.5])


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