[R] variables - data-structure

[John Fox]

Dear Helmut,

How about table(species, sample)?

Regards,
 John

--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox 
-------------------------------- 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Helmut 
> Kudrnovsky
> Sent: Saturday, December 18, 2004 8:31 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] variables - data-structure
> 
> dear R-friends,
> 
> i`ve got a large dataset of  vegetation-samples with about 500
> variables(=species) in the following format:
> 
> 1 spec1
> 1 spec23
> 1 spec54
> 1 spec63
> 2 spec1
> 2 spec2
> 2 spec253
> 2 spec300
> 2 spec423
> 3 spec20
> 3 spec88
> 3 spec121
> 3 spec200
> 3 spec450
> .
> .
> 
> this means:  sample 1 (grassland) with the species (=spec) 1, 
> 23, 54, 63
> 
> is it possible to get a following data-structure for further analysis?
> 
> 		1	2	3	......
> spec1		1	1	0
> spec2		0	1	0
> spec3
> ...
> spec253	0	1	0
> ...
> spec450	0	0	1
> 
> with thanks from the snowy tirol
> helli
> 
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