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AP
AP 2011-7-6
I have a matrix 10000×2, named A. The first column is x and the second column is y. I am trying to find the number of element where the following condition holds:
y<x+b && y>x-b
where b is a constant. I used FIND command to achieve this. I want to make sure it is correct. Thank you very much.
numel(find((A(:,2)<A(:,1)+b) & (A(:,2)>A(:,1)-b)))
I would appreciate quick responses :))))))

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回答（2 个）

Matt Fig
Matt Fig 2011-7-6
Use & instead of && when dealing with array comparisons.
Also, this is faster:
sum((A(:,2)<A(:,1)+b) && (A(:,2)>A(:,1)-b))
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AP
AP 2011-7-6
that was soooo quick thanks.

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Paulo Silva
Paulo Silva 2011-7-6
a=randi([1 10],10,2); %make up some data
x=a(:,1);
y=a(:,2);
b=5;
sum(y<x+b & y>x-b)

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