On Jan 28, 2012, at 3:45 PM, Dimitris Rizopoulos wrote:
how about
x[x < 10 & !is.na(x)]
Besides this and the which() strategy there is also:
subset(x, x<10)
I hope it helps.
Best,
Dimitris
On 1/28/2012 9:36 PM, Federico Calboli wrote:
Dear All,
just a quick example:
x = 1:25
x[12] = NA
x
[1] 1 2 3 4 5 6 7 8 9 10 11 NA 13 14 15 16 17 18 19 20 21
22 23 24 25
y = x[x<10]
y
[1] 1 2 3 4 5 6 7 8 9 NA
Is there any way of NOT getting NA for y = x[x<10]? Similarly
y = x[x<15]
y
[1] 1 2 3 4 5 6 7 8 9 10 11 NA 13 14
How do I get rid of the NA (not post hoc)?
BW
F
--
Federico C. F. Calboli
Neuroepidemiology and Ageing Research
Imperial College, St. Mary's Campus
Norfolk Place, London W2 1PG
Tel +44 (0)20 75941602 Fax +44 (0)20 75943193
f.calboli [.a.t] imperial.ac.uk
f.calboli [.a.t] gmail.com
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--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
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Fax: +31/(0)10/7043014
Web: http://www.erasmusmc.nl/biostatistiek/
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
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