Re: [R] Easy way?

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Subject: Re: [R] Easy way?
From: Martin Maechler (maechler@stat.math.ethz.ch)
Date: Mon 26 Jun 2000 - 18:14:56 EST 

Message-ID: <14679.4352.798491.439564@gargle.gargle.HOWL>

>>>>> "Uwe" == Uwe Ligges <ligges@statistik.uni-dortmund.de> writes:

>> Yves Gauvreau wrote:
>>
>> Hi,
>>
>> Say I have this vector x <- sort(rnorm(n)). I'd like to know if
>> there is a nice way to find out the index of the nearest x to say
>> 1.5?

Uwe> I would try:
         which(abs(x - 1.5) == min(abs(x - 1.5)))

(and Jan Schelling gives the same solution in "modular" steps
 without recomputing "abs(x - 1.5)".)

This is fine and fast enough for moderate data size.
However, since version 1.1

help(which) has

>> See Also:
>> `Logic', `which.min' for the index of the minimum or maximum.
                    ---------
and which.min(), which.max() are really the functions you want to use
here.

Martin Maechler <maechler@stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO D10 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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