How do I solve the following problem with rounding?

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

[Jan]

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

Answer 1

[Amir]

Please try this:

x=-2:0.1:2;
find(abs(x-0.9) < eps)

      ans = 
             30

Answer 2

[Pierre Benoit]

You can use a tolerance :

find(abs(x-0.9) < tol)