[External] R rounding problem?
Thanks Richard. Got it now...
On Thursday, September 3, 2020, 10:12:36 PM PDT, Richard M. Heiberger <rmh at temple.edu> wrote:
FAQ 7.31 On Fri, Sep 4, 2020 at 12:47 AM array chip via R-help
<r-help at r-project.org> wrote:
Hello, I made a mistake today on simple counting in R, that almost got me into trouble. After trying multiple times, I finally figured out it's rounding issue in R. For exmaple, when I just simply type:
(6.9-6.3) > 0.6
[1] TRUE 6.9-6.3 should be 0.6 exactly, but R thinks that it's greater than 0.6!! Similarly, R thinks 5.6-5.5 is smaller than 0.1:
(5.6-5.5) < 0.1
[1] TRUE Why is the above happening? This rounding issue seems to be small, but this could cause serious problem in real world. Can anyone shed a light on how to avoid the issue? Thanks, Yi
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