Area not filled with curve crossing zeros several time, any ideas ?

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Maxime Yon 2017-5-16

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关闭： MATLAB Answer Bot 2021-8-20

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Hello,

I want to filled the area between the zero and a curve.

I use area and it works for a gausien function but not for cardinal sinus.

here is the code :

    w1=-100:0.01:100;        
%%Gaussienne
w0=10;
wg = 10;
Ig = (1./(wg*sqrt(pi)))*exp(-((w1-w0)./(wg)).^2);
area(w1,Ig,'FaceColor',[1 0.6 0.6],'EdgeColor',[1 0 0],'LineWidth',5)
%%Cardinal sinus
w0= 0;
Sig = 0.25;
sc = sin((w1-w0)*Sig)./((w1-w0)*Sig);
area(w1,sc,'FaceColor',[1 0.6 0.6],'EdgeColor',[1 0 0],'LineWidth',5)

Any ideas ?

thank you

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Maxime Yon 2017-5-16

It works with a slightly different period of function

I just multipliy w0 by 1.1 and it works

This will stay a mystery for me...

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Answer 1

Star Strider 2017-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/340521-area-not-filled-with-curve-crossing-zeros-several-time-any-ideas#answer_267241

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Use the hold function.

See if this does what you want:

w1=-100:0.01:100;
% %%Gaussienne
w0=10;
wg = 10;
Ig = (1./(wg*sqrt(pi)))*exp(-((w1-w0)./(wg)).^2);
figure(1)
area(w1,Ig,'FaceColor',[1 0.6 0.6],'EdgeColor',[1 0 0],'LineWidth',5)
% %%Cardinal sinus
w0= 0;
Sig = 0.25;
sc = sin((w1-w0)*Sig)./((w1-w0)*Sig);
hold on
area(w1,sc,'FaceColor',[1 0.6 0.6],'EdgeColor',[1 0 0],'LineWidth',5)
hold off