Re: [R] locating intervals (corrected version)

From: Dimitrios Rizopoulos <>
Date: Wed 09 Aug 2006 - 04:39:31 EST

?findInterval() could be of help in this case.


Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium

Tel: +32/(0)16/336899
Fax: +32/(0)16/337015

Quoting halldor bjornsson <>:

> I have corrected a typo in my previous posting. In what follows the
> line with the inequality is correct
> Hi ,
> I have two sorted vectors X and Xi, where the range of Xi lies within the
> range of X.
> For an element in Xi, I want to find the neigbouring data in X, e.g. find an
> index ix
> so that for element number k, then
> X[ix[k]] < Xi[k] < X[ix[k] +1] # also OK with "<=" on either one, but not
> both
> This is easy to code by looping over the data in X,Xi, but I suspect there
> may be a faster and more elegant way to do this in R.
> In Python (Numeric) the same can be achieved with
> ix=Numeric.searchsorted(X[1:-1],Xi),
> which is quite compact.
> So, does anyone know of a corresponding R call that can achive the same?
> Sincerely,
> Halldˇr
> --
> Halldˇr Bj÷rnsson
> Deildarstj. Ranns. & Ůrˇun
> Ve­ursvi­ Ve­urstofu ═slands
> Halldˇr Bjornsson
> Weatherservice R & D
> Icelandic Met. Office
> [[alternative HTML version deleted]]

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