Thanks to all, it's solved for the frequency resonance graphic(I change x 
and y value to 20,80 to put it in the center( I will look for doing it 
automatically). I will make a new one to get rid of all remarks I have done.
But I have still problem with double graphic each time, I run it.

using Plots
#pyplot(reuse=true)
#plt=PyPlot
R=40;L=1/pi*360E-2;C=1/(pi*360E+2);w=1/(sqrt(L*C))
f=1/(2.*pi*sqrt(L*C))
#omega=2*pi*f
fr=linspace(20,80,100)
y= abs(1 ./ (1+im*2*pi*fr*R*C-(2*pi*fr).^2*L*C))
#using Plots
#y=abs(1./(1+im.*fr.*R.*C-fr.*fr.*L.*C));
plot(fr,y,title="Resonance frequency",
bg=RGB(.2,.2,.2),xlabel ="Hz",ylabel = "Ω")

Le jeudi 16 juin 2016 17:09:33 UTC+2, Henri Girard a écrit :
>
> Tom,
> I have double graph each time in jupyter, before I didn't have this 
> problem with plots ? one is white without grid and the second on is right 
> with black theme ?
> Any help about this ?
>
> Le jeudi 16 juin 2016 09:22:12 UTC+2, Henri Girard a écrit :
>>
>> 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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