'find' returning empty vector

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Sian
Sian 2022-6-14
评论： Stephen23 2022-6-14
I've written this section of code:
for k=0.05:0.05:38
index=find(A(:,2)==k);
c=max(A(index,1));
end
but for k=37.7, it returns index as a 0x1 empty double column vector. For all other values of k it works. However, when I simply do:
index=find(A(:,2)==37.7);
it returns a number. Any ideas why the loop won't? Thanks

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KSSV
KSSV 2022-6-14
tol = 10^-3 ;
index=find(abs(A(:,2)-37.7)<tol);
Read about comparing floating point numbers.

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