From: Matthias Braeunig <mb.atelier_at_web.de>

Date: Tue 27 Jun 2006 - 15:24:37 EST

> X1 X2 X3 X4

*> 0 0.1 0.1 0.1 0.1
*

*> 1 0.2 0.2 0.2 0.2
*

*> 2 0.3 0.3 0.3 0.3
*

*>
*

> [1] 0.1 0.2 0.3

> [1] 0.1

*>
*

*>
*

*>
*

*>
*

*> On 6/26/06, Matthias Braeunig <mb.atelier@web.de> wrote:
*

> Dear R-helpers,

*>
*

*>
*

*> my data.frame is of the form
*

*>
*

*> x <- data.frame( f=gl(4,3), X=rep(0:2,4), p=c(.1,.2,.3))
*

*> x
*

*> f X p
*

*> 1 1 0 0.1
*

*> 2 1 1 0.2
*

*> 3 1 2 0.3
*

*> 4 2 0 0.1
*

*> 5 2 1 0.2
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*> 6 2 2 0.3
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*> 7 3 0 0.1
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*> 8 3 1 0.2
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*> 9 3 2 0.3
*

*> 10 4 0 0.1
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*> 11 4 1 0.2
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*> 12 4 2 0.3
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*>
*

*> which tabulates some values p(X) for several factors f.
*

*>
*

*> Now I want to put it in "wide" format, so that factor levels appear as
*

*> column heads. Note also that X starts from zero. It would be nice if I
*

*> could simply access p_f[X==0] as f[0]. How can I possibly do that?
*

*>
*

*> (The resilting object does not have to be a data.frame. As there are
*

*> only numeric values, also a matrix would do.)
*

*>
*

*> I tried the following
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*>
*

*> y<-unstack(x,form=p~f)
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*> row.names(y) <- 0:2
*

*> y
*

*> X1 X2 X3 X4
*

*> 0 0.1 0.1 0.1 0.1
*

*> 1 0.2 0.2 0.2 0.2
*

*> 2 0.3 0.3 0.3 0.3
*

*>
*

*> Now, how to access X3[0], say?
*

*>
*

*> Maybe reshape would be the right tool, but I could not figure it out.
*

*>
*

*> I appreciate your help. Thanks!
*

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jun 27 15:30:49 2006

Date: Tue 27 Jun 2006 - 15:24:37 EST

jim holtman wrote:

> You need to specify the row/column name as character:

*>
*

>> y

> X1 X2 X3 X4

>> y[,'X3']

> [1] 0.1 0.2 0.3

>> y['0','X3']

> [1] 0.1

>>

> Dear R-helpers,

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jun 27 15:30:49 2006

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