Why my program makes an infinite loop when I put a value squared ?

Good morning, I don't understand why my matlab program runs in a loop when I squared a value. If someone could explain to me. I helped myself with an example found in the matlab help or on the site at this address : https://fr.mathworks.com/examples/pde/mw/pde-ex98125052-vibration-of-square-plate?s_tid=srchtitle

if true
 close all
clear all
N=3; %Nombre de composants de l'équation d'élasticité
model = createpde(N); %Création du modèle 3D
importGeometry(model,'plaque.stl');%Importation de la plaque fais sur solidworks
figure
hc = pdegplot(model,'FaceLabels','on'); %identification du nombre de face
hc(1).FaceAlpha = 0.1;   %Niveau de transparence du graphe
title('Plate with Face Labels') %titre
E = 200e9; % Module de Young en Pascals de l'acier
nu = 0.3; % coefficient de poison
rho = 8000; % Densité du matériau kg/m^3
c = elasticityC3D(E,nu); % mettre coeff + module dans la boite outil
a = 0;
specifyCoefficients(model,'m',rho,'d',0,'c',c,'a',a,'f',0);
applyBoundaryCondition(model,'mixed','Face',1:4,'u',0,'EquationIndex',3);
hmax = 12; %Pour 12 noeud de maillage
generateMesh(model,'Hmax',hmax,'GeometricOrder','quadratic');% création du maillage à 12 noeud pour une meilleure precision
figure
pdeplot3D(model); %vue 3D du maillage
title('Maille de la plaque');
refFreqHz = [0 0 0 45.897 109.44 109.44 167.89 193.59 206.19 206.19]; % Valeur de référence publié
%freqHz = [8.87E-06 1.06E-5 1.22E-5 44.871 109.74 109.77 168.59 193.74 207.51 207.52];
maxFreq = (1.1*refFreqHz(end)*2*pi).^2;%Calcul de la pulsation
r = [-.1 maxFreq];
result = solvepdeeig(model,r);%permet de calculer toutes les solutions
eVec = result.Eigenvectors;
eVal = result.Eigenvalues;
numEig = size(eVal,1);
freqHz = eVal(1:numEig)/(2*pi);
fprintf('Frequency(Reference 1),Hz  Frequency(solvepdeeig),Hz\n');
numToPrint = min(length(freqHz),length(refFreqHz));
for i=1:numToPrint
fprintf('%10.5g              %10.5g\n', ...
refFreqHz(i),freqHz(i));
end
h = figure;
h.Position = [100,100,900,600];
for i = 1:numToPrint
  subplot(4,2,i);
  pdeplot3D(model,'ColorMapData',eVec(:,3,i));
  axis equal
  title(sprintf(['Mode=%d, z-displacement\n', ...
  'Frequency(Hz): Ref=%g FEM=%g'], ...
  i,refFreqHz(i),freqHz(i)));
end

end