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How do I solve the following problem with rounding?

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Nikola Mirkov
Nikola Mirkov 2014-10-21
编辑： Jan 2014-10-21
I run the following code:
clear all
x=-2:0.1:2;
find(x==0.9)
I get:
ans = Empty matrix: 1-by-0
How can I fix this problem? The version I use is R2013a.
Thanks! niko
  1 个评论
Jan
Jan 2014-10-21
编辑：Jan 2014-10-21
Avoid the clear all, because this is more brute than useful.
This is one of the most frequently asked questions. I suggest to read the other ones also: http://matlab.wikia.com/wiki/FAQ

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回答（2 个）

Amir
Amir 2014-10-21
编辑：Amir 2014-10-21
Please try this:
x=-2:0.1:2;
find(abs(x-0.9) < eps)
ans =
30
Pierre Benoit
Pierre Benoit 2014-10-21
You can use a tolerance :
find(abs(x-0.9) < tol)

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