Rather than using an epsilon for float comparison, can you reliably compare two floats for equivalency by rounding them to the desired precision?
For example:
round($float, 3) === round($otherFloat, 3)
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if your ok compering, round(float), and not the original float, then its fine – Aug 21 '15 at 00:36
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That is what I am asking. For the record, I didn't ask how should I compare floating point numbers, this is not a duplicate question. – user1842104 Aug 21 '15 at 17:58
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No. If your numbers are just barely on opposite sides of the value where the function will round up instead of down (a half-integer if you're round to the nearest integer), then they will round to different numbers no matter how close together they are.
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Good point, but am I correct in assuming that would only matter if I was rounding to a very high precision? – user1842104 Aug 21 '15 at 17:58