Greater than is giving inconsistent answer

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Amanda Beatty 2021-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/1450279-greater-than-is-giving-inconsistent-answer

编辑： Amanda Beatty 2021-9-9

I am running two (slightly different) matalb programs in two different windows and getting incosistent answers on a very simple "greater than" equation. It is baffling me. 0.0417 is SOMETIMES > 0.0417, but not other times.

What am I missing here?

Window #1

Window #2

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Answer 1

Image Analyst 2021-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/1450279-greater-than-is-giving-inconsistent-answer#answer_784329

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They're probably off in the 15th decimal place or something. Try this

format long

If that doesn't work try

fprintf('%30f\n', ans2);

There should be a difference somewhere. See the FAQ:

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

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Amanda Beatty 2021-9-9

编辑：Amanda Beatty 2021-9-9

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They're still identical with format long and the fprintf you suggested, but using

sprintf('%20.18f\n',ans2)

from the link you posteds shows that they are different on the 17th decimal. Thank you! It looks like that originates from an interp1 calculation a while back in the code.

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