[R] is there an inverse method for table()?
Ravi Varadhan
rvaradhan at jhmi.edu
Tue Mar 9 17:03:58 CET 2010
Sorry, I mean to say:
z <- rep(x, y)
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: Ravi Varadhan <rvaradhan at jhmi.edu>
Date: Tuesday, March 9, 2010 11:02 am
Subject: Re: [R] is there an inverse method for table()?
To: vincent laperriere <vincent_laperriere at yahoo.fr>
Cc: r-help at r-project.org
> 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]]
> >
> > ______________________________________________
> > R-help at r-project.org mailing list
> >
> > PLEASE do read the posting guide > and provide commented, minimal, self-contained, reproducible code.
>
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