[R] findInterval() surprising behavior

[Rui Barradas]

Hello,

Same on Windows 7.

 > findInterval(x=c(6, 1, 1, 1), vec=c(0, 1, 3, 5, 10), left.open=TRUE)
[1] 4 2 1 1
 > findInterval(x=c(4, 1, 1, 1), vec=c(0, 1, 3, 5, 10), left.open=TRUE)
[1] 3 1 1 1
 > sessionInfo()
R version 3.3.1 (2016-06-21)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

locale:
[1] LC_COLLATE=Portuguese_Portugal.1252 
LC_CTYPE=Portuguese_Portugal.1252
[3] LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C 

[5] LC_TIME=Portuguese_Portugal.1252

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

other attached packages:
[1] lattice_0.20-33

loaded via a namespace (and not attached):
[1] tools_3.3.1 grid_3.3.1

Rui Barradas

Em 17-10-2016 20:03, Dmitriy Chernykh via R-help escreveu:
> 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.
>