less than against less or equal than

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Ioannis Vourvachakis
评论： Ioannis Vourvachakis 2021-11-2
Can someone tell me what is going on? Thank you

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Stephen23
Stephen23 2021-11-2
编辑：Stephen23 2021-11-2
Ran in:
"Can someone tell me what is going on"
Exactly as the comparison tells you, the value stored in that variable is greater than the literal 0.3060.
Such cases are easy to demonstrate:
A = 0.3060 + eps(1)
A = 0.3060
A > 0.3060
ans = logical
1
Read more about binary floating point numbers:
https://www.mathworks.com/matlabcentral/answers/57444-faq-why-is-0-3-0-2-0-1-not-equal-to-zero
https://www.mathworks.com/matlabcentral/answers/316889-why-two-equal-numbers-are-not-equal
http://www.mathworks.com/matlabcentral/answers/102419-how-do-i-determine-if-the-error-in-my-answer-is-the-result-of-round-off-error-or-a-bug
http://www.mathworks.com/matlabcentral/answers/140656-about-numerical-difficulty-of-equality-comparison-operation-between-two-double-real-numbers-in-matlab
This is worth reading as well:
https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
http://faculty.tarleton.edu/agapie/documents/cs_343_arch/papers/1991_Goldberg_FloatingPoint.pdf
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Steven Lord
Steven Lord 2021-11-2
You can see this effect in real life too. Search Google or your favorite search engine for "Bill Gates net worth". When I did that Google told me he was worth 136.1 billion USD. Does that mean his net worth is exactly 136 billion 100 million USD and not a penny more? No. He could have an extra million or ten in his portfolio that Google didn't display.
Ioannis Vourvachakis
Ioannis Vourvachakis 2021-11-2
thank you very much! I had no idea, so you helped me and I appreciated it.

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