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function[p,res,iter]=pfixe(x0,eps,nmax)
x=x0;
phix=phi(x);
iter=0;
err=abs(phix-x);
while(err>eps)&(iter<=nmax)
iter=iter+1;
x=phix;
phix=phi(x);
end;
if iter>nmax
disp('convergence non atteint');
else
p=x;
res=phix-x;
disp('convergence atteint');
end