Message-ID: <003701c1d57c$e1ab85a0$3d2d56d2@n1bliarfyrd5b7>
Date: 2002-03-27T10:48:07Z
From: Ko-Kang Kevin Wang
Subject: Extracting the first element of a list
Hi,
----- Original Message -----
From: "Uwe Ligges" <ligges at amadeus.statistik.uni-dortmund.de>
To: "Ross Darnell" <r.darnell at shrs.uq.edu.au>
Cc: <r-help at stat.math.ethz.ch>
Sent: Wednesday, March 27, 2002 8:03 PM
Subject: Re: [R] Extracting the first element of a list
> For the first element of a list L:
> L[[1]]
> For the first elements of all elements (vector) of the list:
> lapply(L, function(x) x[1])
So, suppose I've got a vector called foo, which has elements as follows:
305 159 251 215 101 224 306 199 194 325 329 221 318 238 17 ....
(the rest omittied)
And suppose I want to extract out the first digit of each number, so like:
3 1 2 2 1 2 3 1 1 3 3 2 3 2 1...
Do I still use
lapply(foo, function(x) x[1])
it doesn't seem to work...
Thanks
Kevin
>
> Uwe Ligges
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