Simple loop doesn't work

This is crazy, have been stuck on this MATLAB code for ages. What I've got is the following:

for i = 1 : 0.1 : 5

    index = find(someArray == i)
  开发者_如何学JAVA  %do stuff

end

Now the first time the loop runs, when i = 1, index returns a correct value (e.g. 45). Now, the second time the loop runs, index gets set to an empty set of brackets - '[]' ...! (The same happens for the rest of the iterations).

This is crazy because starting the loop at 1.1 sets index to a logical numerical value. In fact, every iteration should set a logical value for index using find. So it's like 'find' doesn't like being used inside loops or something....

Any ideas or help is much appreciated!

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Are you sure that someArray contains the value 1.1? This could simply be a problem with floating point precision. There's lots of information about this sort of thing on the web, including:

http://www.mathworks.com/company/newsletters/news_notes/pdf/Fall96Cleve.pdf

http://floating-point-gui.de/

http://www.mathworks.com/support/tech-notes/1100/1108.html

http://www.mathworks.com/help/techdoc/matlab_prog/f2-12135.html?#bqxyrhp