Hi,
When I make my plots I have two plots, but before I hadn't this...
w is the resoning frequency, but it should appear at 0 (zéro) not at extrem 
? 
Any help, I already ask for help with pyplot, this link : 
https://groups.google.com/forum/#!topic/julia-users/EJSvutfdEus, which 
works fine for angular pulsation, but I want frequency resonance with Plots 
because I guess I can make more beautifull graphic (anyway I don't know 
well PyPlot or Plots). I succeeded once with pyplot but after an error I 
couldn't find it back !
Bad luck :)
Kind regards
HG

using Plots
pyplot(reuse=true)
z=10;u=0.02;s=0.02;w=1/(2*pi*sqrt(u*s))
f=linspace(-30,30)
y=abs(1./(1+im.*f.*z.*s-f.*f.*u.*s));
#fig = figure("Angle")
plot(f, y)

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