[R] findInterval() surprising behavior

[Dmitriy Chernykh]

Hello,

I call function findInterval in the following way:

findInterval(x=c(6, 1, 1, 1), vec=c(0, 1, 3, 5, 10), left.open=TRUE),

and expect that it will return 4 1 1 1. But the function returns 4 2 1 1 instead. Moreover, if I change the first element in x to, say, 4 -

findInterval(x=c(4, 1, 1, 1), vec=c(0, 1, 3, 5, 10), left.open=TRUE)

then the function returns 3 1 1 1.

Why are results for identical elements in x not the same? And why is element in x influenced by previous one? I suspect this is a bug but I am not 100% sure.

Technical details:

sessionInfo()
R version 3.3.1 (2016-06-21)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 14.04.5 LTS

locale:
 [1] LC_CTYPE=ru_RU.UTF-8       LC_NUMERIC=C               LC_TIME=ru_RU.UTF-8        LC_COLLATE=ru_RU.UTF-8     LC_MONETARY=ru_RU.UTF-8   
 [6] LC_MESSAGES=ru_RU.UTF-8    LC_PAPER=ru_RU.UTF-8       LC_NAME=C                  LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=ru_RU.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] tools_3.3.1


Thanks.

-- 
Dmitrii Chernykh
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