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using find function

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Kugen Raj
Kugen Raj 2012-2-22
im having a problem to find the correct value that i desire. im trying to plot graph for beamwidth for uniform array. but, the problem is that when i use the find function to find the angles which has -3dB gain, there is an error. so, i rounded up the -3dB angles to make it easy to use the find function. then, the rounded is not accrurate and consist some undesired value. example: p=-3.0041 -3.2098 -3.2000. I rounded up the value and it makes the value to become p= -3 -3 -3. hence, it contains some undesired value and makes it complicate to plot the graph. can anyone help to overcome this problem.

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回答（2 个）

Grzegorz Knor
Grzegorz Knor 2012-2-22
If I understand you correctly, try to round your vector roughly this way:
round(p*100)/100
or use find something like that:
find(abs(p-3)<0.001)
  1 个评论
Kugen Raj
Kugen Raj 2012-2-23
hi grzegorz,
Thanks for your suggestion. I tried as your showed here. But, I still cannot overcome the problem.
Y=sum(y);
YY=abs(Y);
p=20*log10(YY/max(YY));%normalized power in dB.
P=nearest(p);
PP=find(abs(P-3)<0.0001);
if size(PP)==[1,0];
bw(count2)=0;
else
bw(count2)=PP(1,2)-PP(1,1);
end
I'm still finding if there is any other alternative way to overcome this issue.

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Walter Roberson
Walter Roberson 2012-2-22

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