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

2013 5 3
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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

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