[R] vectors into a matrix

[Bert Gunter]

This is one of those times where do.call() comes in very handy: first
convert the vector names into a list using lapply and get() and then call
do.call with cbind on the list:

do.call(cbind,lapply(paste("VD",1:12,sep=""),get))

This also illustrates the virtue of putting such vectors in a list to begin
with, as then the lapply(paste...) operation can be dispensed with, making
things much more efficient.


Bert Gunter
Genentech Nonclinical Biostatistics
 
 
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Henrique Dallazuanna
Sent: Monday, January 04, 2010 11:00 AM
To: Victor Kyros
Cc: r-help at r-project.org
Subject: Re: [R] vectors into a matrix

Try this:

cbind(ID = as.numeric(gsub("VD", "", ls(patt = "VD\\d+"))) ,
t(sapply(ls(patt = "VD\\d+"), get)))

On Mon, Jan 4, 2010 at 3:32 PM, Victor Kyros <varenda44 at gmail.com> wrote:
> Dear all,
>
> I'm writing code to do automatically several
> calculations and gather the results in a matrix.
>
>
> I have the following vectors and
> I just want to make a matrix with them:
>
> VD1
> VD2
> VD3
> ...
> VD12
>
> *In this case, this series of vectors stops there, in 12,
> but it could be a higher number or smaller.
> (for example: VD1, VD2 and VD3; only)
> (or for example: VD1, VD2, ... till VD78)
>
> All vectors have the same length, 9.
> And vectors should be entered by row.
> Besides, I would like to add a column with the number of the vector.
>
> Something like this:
>
> 1     44    23    0.3    ...
> 2     51    27    0.8    ...
> 3     40    24    0.6    ...
> 4     47    18    0.2    ...
> 5     52    30    1.2    ...
> ...   ...   ...   ...    ...
> 12    39    22    0.5    ...
>
>
> I hope I've explained myself good enough.
> Thanks in advance for taking the time to help me.
>
> Vilen
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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