R help - Sep 2009 - A point in a vector?

Dear list,

I have a strange requirement .... I have a vector, for example v<-
c(0,0,0,0,1,2,4,6,8,8,8,8). I have a value,for example x<- 4.8. 

I would like to understand in which sub interval of v is x. In this case, v 
would be in the sub interval [4,6] that is in the subinterval starting from 
element j=7 to the element j+1=8.

Can we do that with an R command?

Regards
-- 
Corrado Topi

Global Climate Change & Biodiversity Indicators
Area 18,Department of Biology
University of York, York, YO10 5YW, UK
Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk

Try this:

v[findInterval(x, v) + 0:1]

On Wed, Sep 30, 2009 at 5:10 PM, Corrado <ct529 at york.ac.uk>
wrote:
> Dear list,
>
> I have a strange requirement .... I have a vector, for example v<-
> c(0,0,0,0,1,2,4,6,8,8,8,8). I have a value,for example x<- 4.8.
>
> I would like to understand in which sub interval of v is x. In this case, v
> would be in the sub interval [4,6] that is in the subinterval starting from
> element j=7 to the element j+1=8.
>
> Can we do that with an R command?
>
> Regards
> --
> Corrado Topi
>
> Global Climate Change & Biodiversity Indicators
> Area 18,Department of Biology
> University of York, York, YO10 5YW, UK
> Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O

Hi,

assuming v is sorted, try this,

v[ findInterval(x,v)+0:1 ]

see ?findInterval and perhaps ?cut

HTH,

baptiste



2009/9/30 Corrado <ct529 at york.ac.uk>:
> Dear list,
>
> I have a strange requirement .... I have a vector, for example v<-
> c(0,0,0,0,1,2,4,6,8,8,8,8). I have a value,for example x<- 4.8.
>
> I would like to understand in which sub interval of v is x. In this case, v
> would be in the sub interval [4,6] that is in the subinterval starting from
> element j=7 to the element j+1=8.
>
> Can we do that with an R command?
>
> Regards
> --
> Corrado Topi
>
> Global Climate Change & Biodiversity Indicators
> Area 18,Department of Biology
> University of York, York, YO10 5YW, UK
> Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

On Sep 30, 2009, at 4:10 PM, Corrado wrote:
> Dear list,
>
> I have a strange requirement .... I have a vector, for example v<-
> c(0,0,0,0,1,2,4,6,8,8,8,8). I have a value,for example x<- 4.8.
>
> I would like to understand in which sub interval of v is x. In this  
> case, v
> would be in the sub interval [4,6] that is in the subinterval  
> starting from
> element j=7 to the element j+1=8.
sum(x > v)

 > v[sum(x > v)]
[1] 4
 > v[sum(x > v)+1]
[1] 6
>
> Can we do that with an R command?
>
-- 
David Winsemius, MD
Heritage Laboratories
West Hartford, CT