Problem with ezplot function and transcritical bifurcation, but not with other bifurcations

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When running the script I get:
Error using ezplot (line 163) mu cannot be plotted in the xy-plane.
Error in sym/ezplot (line 76) h = ezplot(fhandle(f),varargin{:});
It does'n happen with other bifurcation cases
%--------the code----
global mu syms x y figure(1) Critical_points=solve('mu*x-x^2','-y'); Plot_critical_points_x_p=ezplot(Critical_points.x(1),[-2,2]);hold on set(Plot_critical_points_x_p,'color',[0.5 0.5 0.5], 'Linewidth', 1); Plot_critical_points_x_m=ezplot(Critical_points.x(2),[-2,2]); set(Plot_critical_points_x_m,'color','black','linestyle','--', 'Linewidth', 1) legend('stable solution', 'unstable solution') title(['Bifurcation Diagram',' Trans_Critical_Bifurcation']); axis ([-2 2 -2 2])


Youssef  Khmou
Youssef Khmou 2015-2-3
The ezplot function returns the following error message :
Input must be a string expression, function name, function handle, or INLINE object
the result is mu, so a constant, but if you use function it works correctly, here is an example :

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