How reliable is comparing Doubles? Should I create...
# announcementsh
Hullaballoonatic
05/02/2019, 4:40 AMHow reliable is comparing Doubles? Should I create a safe compare function with some small wiggle room?
like
fun Double.equals(b: Double): Boolean = abs(this - b) < 1e-20s
spand
05/02/2019, 7:23 AMI would expect it to be a bitwise equality. Any error tolerance seems would be quite domain specific imo
k
karelpeeters
05/02/2019, 7:38 AMIt's reliable, but of course the operations aren't, eg they're not commutative/associative/... and so when you're unit testing there are usually functions like that that take a precision parameter
s
streetsofboston
05/02/2019, 11:20 AMComparing Doubles is very reliable. They adhere, in most languages, to this:
https://en.wikipedia.org/wiki/Double-precision_floating-point_format
😍 1
h
Hullaballoonatic
05/02/2019, 7:19 PMThank you so kindly, Anton
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