Converting a linear equation to decibel
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I'm trying to convert a linear polar plot to decibel but I don't know how to proceed. Here is the original:
theta = 2*pi*linspace(0, 1, 30);
r = cos(theta/2).^2;
polar(theta, r,'r-');
This is my progress so far:
theta = 2*pi*linspace(0, 1, 30);
r = 10*log10(abs(cos(theta/2).^2));
b = find(r(-40))
b == -40
b = b + 40
polardb(theta, r, -40,'r-');
I don't know how to proceed.
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Accepted Answer
Star Strider
on 18 Sep 2021
The
‘theta’
vector likely needs to have more points, however that appears to be correct.
I use a slightly different approach here —
theta = 2*pi*linspace(0, 1, 30);
r = cos(theta/2).^2;
figure
polarplot(theta, r,'r-')
title('r(\theta)')
figure
polarplot(theta, mag2db(r),'r-')
title(的r(\θ)(dB)')
rt = rticklabels;
rticklabels(cellfun(@(x)sprintf('%s dB',x),rt','Unif',0))
.
2 Comments
Star Strider
on 18 Sep 2021
My pleasure!
If my Answer helped you solve your problem, please
Accept
it!
.
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