Couldn't find the position of a value in vector

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Enez Furkan Cihan
Enez Furkan Cihan 2018-11-24
评论： Enez Furkan Cihan 2018-11-24
tryna find a value's location but gives me empty double row vector, why?
My vector is q and its size 1x4406 double. couldn't find out where 0.0500 is. Tried to use this " k=find(q==0.0500) " but didn't get anything worth.
Thanks in advance

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the cyclist
the cyclist 2018-11-24
编辑：the cyclist 2018-11-24
The value is not exactly equal to 0.05, due to floating point representation. Try
tol = 1.e-6;
k=find(abs(q-0.0500)<tol);
Read this documentation page about floating point for details.
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the cyclist
the cyclist 2018-11-24
Here are the elements that are nearest 0.05. Note that none of them are equal to 0.05. They are also not even with 1.e-6, which is why my code did not work.
You can change my value of tol to get as close as you need.
format long
q(2198:2206)
ans =
Columns 1 through 6
0.049918594104308 0.049941269841270 0.049963945578231 0.049986621315193 0.050009297052154 0.050031972789116
Columns 7 through 9
0.050054648526077 0.050077324263039 0.050100000000000
Enez Furkan Cihan
Enez Furkan Cihan 2018-11-24
how i couldn't think that! Thank you so much. I appreciate.

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