Scala's Range with Float performance does not meet expectations

Asked May 19 '16 at 22:29

Active May 19 '16 at 22:36

Viewed 32 times

I typed the code below in scala console and get the return:

scala> 1.0F to 5.0F by 1.3F
res10: scala.collection.immutable.NumericRange[Float] = NumericRange(1.0, 2.3, 3.6, 4.8999996)

why the ret is NumericRange(1.0, 2.3, 3.6, 4.8999996) instead of NumericRange(1.0, 2.3, 3.6, 4.9) ?

edited May 19 '16 at 22:36

jub0bs

asked May 19 '16 at 22:29

zwb

1

0.3 in base 10 is a repeating decimal in binary, which gets truncated, and hence you get the difference that you see. – Michael Zajac May 19 '16 at 22:34
2

This comes up over and over again. So much so that there's a website dedicated to it: http://floating-point-gui.de/ – The Archetypal Paul May 20 '16 at 06:49

0 Answers0