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How to make polardb finction work

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han han
han han on 7 Feb 2020
Commented: ZY G on 27 Apr 2020
I want to draw a beam, but I refer to the example in this article.
Code source
I want to draw the beam as shown below
figure('NumberTitle','off','Name','Figure 11.9 in Polar','Position',[0 0 600 850]);
title('Beampattern Using Definition');
grid on;
Will show the following error
Where is polardb defined?
How to correct it?

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