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Asked By | Matt101 |
Can someone explain to me how the is_equal_approx method works? I’ve read the documents, but I couldn’t quite understand how it works, especially regarding the function parameters.
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Reply From: | klaas |
Hi
the function will return true when a and b are equal or only have a very slight deviation.
The tolerance scales with size of the numbers. Higher numbers are treated with a higher tolerance when compared.
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Reply From: | Wakatta |
It turns out that most fractional decimals cannot be represented precisely in binary and so there are a lot of fractional decimals which are approximated when stored in the computer causing what is known as floating point imprecision
An epsilon (Greek Letter) is used by is_equal_approx to determine if two floating points shall be considered equal or not and the function name is self explanatory hence the vague documentation.
is_equal_approx(1.39999, 1.4) # yes it is
Same should apply for Rects, Basis, Vectors, Transforms
The numbers in your example have too great of a difference. Also, there should be no capitalization (at least for engine version 3.5). Here:
is_equal_approx(1.399999999, 1.4) # yes it is
Now the difference should be less than epsilon, making the numbers “approximately equal”.
qdeanc | 2023-02-02 17:42
You input has been considered and Corrected
Wakatta | 2023-02-02 22:07