Nick Drew wrote:
Hi, I recently spent quite a bit of time trouble
shooting a function that I had written only to
discover that the problem I was having was with the
comparison operator. I assumed that the following
would return TRUE:
This is a very common error. In R 2.1.0, it's FAQ
7.31 Why doesn't R think these numbers are equal?
Duncan Murdoch
testMean <- 82.8 + 0.1
testMean
[1] 82.9
testMean == 82.9
[1] FALSE
Apparently this has to do with deciml places. Look:
newTest <- 82.0
newTest
[1] 82
newTest == 82
[1] TRUE
newTest == 82.0
[1] TRUE
What does signif() do to my object called "testMean"
so that the comparison now evaluates to TRUE?
signif(testMean, 3) == 82.9
[1] TRUE
Version info:
R.Version()
$platform
[1] "i386-pc-mingw32"
$arch
[1] "i386"
$os
[1] "mingw32"
$system
[1] "i386, mingw32"
$status
[1] ""
$major
[1] "2"
$minor
[1] "1.0"
$year
[1] "2005"
$month
[1] "04"
$day
[1] "18"
$language
[1] "R"
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
