Use of "find" command

I've a vector with 20000 elements. taux1=[0.01 0.02 ... 200]. If I type p=find(taux1==0.02), it returns p=2. Ok! If I type max(taux1), it returns ans=200.0000. Ok! But, if p=find(taux1==200), the answer is p=Empty matrix: 1-by-0. Others "round" values have shown the same answer, even if the entry have consider decimals (for example, taux1==200.0000). However, if I type p=find(taux1==max(taux1)), it returns p=20000. What may be happening? Thanks!

Answer 1

[Walter Roberson]

Floating point roundoff. Those values only look like they are integers.

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

[Alexandre Lopes]

Thank you, Walter. Do you suggest any modification in my "find" command? I tried the "areEssentiallyEqual...", but it didn't work within this command...

[Walter Roberson]

You can use ismembertol() . The first output is a logical vector; the second output is indices.

[Alexandre Lopes]

Thanks!