[R] Floating points and floor() ?

From: Folkes, Michael <Michael.Folkes_at_dfo-mpo.gc.ca>
Date: Thu, 03 Mar 2011 18:23:36 -0800

Perhaps somebody could clarify for me if the following is a floating point matter or otherwise, and how am I to correct for it?

> floor(100*.1)

[1] 10

> 100*(1.0-.9)
[1] 10

> floor(100*(1-0.9))
[1] 9


Michael Folkes
Salmon Stock Assessment
Canadian Dept. of Fisheries & Oceans Pacific Biological Station
3190 Hammond Bay Rd.
Nanaimo, B.C., Canada
Ph (250) 756-7264 Fax (250) 756-7053 Michael.Folkes_at_dfo-mpo.gc.ca

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