Different results in comparison of the same number, one being approach from 0.2 and the other from 0.1

I approach 0.8 with two different intervals first with intervals of 0.1 it does it one more time than needed and then with intervals of 0.2 and that is fine.

I can also approach a different number like 1.2 and there is also ok, but 0.8 being approach by 0.1 crashes. My initial guess is that it has something to do with the way matlab handles the numbers, but honestly I have no clue on what is happening. Is there any way to solve this?? Below is some code that reproduce what I'm saying. Just in case you might ask I try this on a colleague computer and has the same behaviour, so its not exclusive to my computer

>> h = 0.1; >> while h < t h = h+0.1; disp(h) end 0.2000

    0.3000

    0.4000

    0.5000

    0.6000

    0.7000

    0.8000

    0.9000

>> h = 0.2; >> while h < t h = h+0.2; disp(h) end 0.4000

    0.6000

    0.8000

Answer 1

[dpb]

See the FAQ

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F