find and ismember are not working for one number in a vector

Hey, I am new here and I searched a couple of time for my subject but I could not find anything. My question: I have a vector x=0.4:0.02:0.6; When I try to use "find" [find(x==0.42) --> empty matrix] or "ismember" [ismember(0.42,x) --> 0] to find the indexes of the numbers it is working for all number except the number 0.42. Can somebody tell me how that is possible and how I can solve this issue? Kind regards

Ralf

Answer 1

[Iman Ansari]

Hi. See this:

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

Answer 2

[Ralf Sch]

But how can I solve this problem then?

[Iman Ansari]

x=0.4:0.02:0.6;
find(abs(x-.42)<0.001)

[Ralf Sch]

Thank you