[R] is there an inverse method for table()?

[Ravi Varadhan]

z <- rep(x, each = y)

Hope this helps,
Ravi.

____________________________________________________________________

Ravi Varadhan, Ph.D.
Assistant Professor,
Division of Geriatric Medicine and Gerontology
School of Medicine
Johns Hopkins University

Ph. (410) 502-2619
email: rvaradhan at jhmi.edu


----- Original Message -----
From: vincent laperriere <vincent_laperriere at yahoo.fr>
Date: Tuesday, March 9, 2010 10:59 am
Subject: [R] is there an inverse method for table()?
To: r-help at r-project.org


> Hi,
>  
>  In R, I know the method table(), which builds a contingency table of 
> the counts y at each level for the factor x.
>  But I would like to know what is the inverse method of table(), if it 
> exists, to obtain the vector z, from the two vectors x and y?
>  
>  x <- (86,  90,  94,  98, 102, 106, 110, 114, 118, 122, 126, 130, 134, 
> 138, 142, 146, 150, 154, 158, 162, 166, 170, 174)
>  y <- c(2, 5, 10, 17, 26, 60, 94, 128, 137, 128, 77, 68, 65, 60, 51, 
> 26, 17, 9, 5, 2, 3, 7, 3)
>  
>  > z
>     [1]  86  86  90  90  90  90  90  94  94  94  94  94  94  94  94  
> 94  94  98  98  98  98  98  98  98  98  98  98  98  98  98  98  98  98 
>  98 102 102 102 102 102
>    [40] 102 102 102 102 102 102 102 102 102 102 102 102 102 102 102 
> 102 102 102 102 102 102... 
>    [976] ...170 170 170 170 170 170 170 174 174 174
>  
>  If such a method does not exist, what code should I type to obtain 
> the complete series quickly?
>  
>  Thank you for your help.
>  I use version 2.10-1 2009-08-24 for Mac OS.
>  
>  Vincent Laperrière.
>  
>  
>        
>  	[[alternative HTML version deleted]]
>   
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