Dear R users,
I have just start working with R and would need some help.
If you have a matrix as:
[,1] [,2] [,3]
[1,] 11 24 11
[2,] 16 29 16
[3,] 2 15 2
and you want the position where you can find the maximum value, in this
case row 2 and column 2.
How could you get the position?
The values in the matrix is likelihood function values, and each row and
column represent values from two parameters. So the idea is to seek which
parameter values maximise the likelihood and therefore I need boot row and
column position.
Regards Jim
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Hi Jim,
you could try this:
mat <- matrix(sample(1:25), 5, 5)
mat
row(mat)[mat==max(mat)]
col(mat)[mat==max(mat)]
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Doctoral Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/396887
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/
http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message -----
From: "Jim Gustafsson" <jgu at Codan.DK>
To: <r-help at stat.math.ethz.ch>
Sent: Wednesday, August 25, 2004 11:07 AM
Subject: [R] R-help
>
> Dear R users,
>
> I have just start working with R and would need some help.
>
> If you have a matrix as:
>
>
> [,1] [,2] [,3]
> [1,] 11 24 11
> [2,] 16 29 16
> [3,] 2 15 2
>
> and you want the position where you can find the maximum value, in
this> case row 2 and column 2.
> How could you get the position?
>
> The values in the matrix is likelihood function values, and each
row and> column represent values from two parameters. So the idea is to seek
which> parameter values maximise the likelihood and therefore I need boot
row and> column position.
>
> Regards Jim
>
>
> --------------------------------------------------------------------
----------> This e-mail and any attachment may be confidential and may also be
privileged.> If you are not the intended recipient, please notify us immediately
and then> delete this e-mail and any attachment without retaining copies or
disclosing> the contents thereof to any other person.
> Thank you.
> --------------------------------------------------------------------
----------> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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
On Wed, 25 Aug 2004 11:07:24 +0200 Jim Gustafsson <jgu at Codan.DK> wrote:> > Dear R users, > > I have just start working with R and would need some help. > > If you have a matrix as: > > > [,1] [,2] [,3] > [1,] 11 24 11 > [2,] 16 29 16 > [3,] 2 15 2 > > and you want the position where you can find the maximum value, in this > case row 2 and column 2. > How could you get the position?> mat <- matrix(c(11,16,2,24,29,15,11,16,2), ncol = 3) > mat[,1] [,2] [,3] [1,] 11 24 11 [2,] 16 29 16 [3,] 2 15 2> which(mat == max(mat), arr.ind = TRUE)row col [1,] 2 2> The values in the matrix is likelihood function values, and each row and > column represent values from two parameters. So the idea is to seek which > parameter values maximise the likelihood and therefore I need boot row and > column position.HTH, Tobias
Or you could use:
mat <- matrix(sample(1:25), 5, 5)
mat
which(mat==max(mat),arr.ind = T)
Wayne
-----Original Message-----
From: Jim Gustafsson [mailto:jgu@Codan.DK]
Sent: 25 August 2004 10:07
To: r-help@stat.math.ethz.ch
Subject: [R] R-help
Dear R users,
I have just start working with R and would need some help.
If you have a matrix as:
[,1] [,2] [,3]
[1,] 11 24 11
[2,] 16 29 16
[3,] 2 15 2
and you want the position where you can find the maximum value, in this
case row 2 and column 2.
How could you get the position?
The values in the matrix is likelihood function values, and each row and
column represent values from two parameters. So the idea is to seek which
parameter values maximise the likelihood and therefore I need boot row and
column position.
Regards Jim
----------------------------------------------------------------------------
--
This e-mail and any attachment may be confidential and may also be
privileged.
If you are not the intended recipient, please notify us immediately and then
delete this e-mail and any attachment without retaining copies or disclosing
the contents thereof to any other person.
Thank you.
----------------------------------------------------------------------------
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[[alternative HTML version deleted]]
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Dear all, Does anyone know how to read files with .dbf extension? Thanks for your time.
Did you do a search at "www.r-project.org" -> "R site
search"?
Searching for ".dbf" there just now exposed a "read.shape"
function in
the maptools package.
hope this helps.
p.s. Did you read the posting guide!
"http://www.R-project.org/posting-guide.html"? Tips provided there
may
help you answer questions like this for yourself. Failing that, they
may also help you formulate your questions so you are more likely to get
useful replies. Buena suerte.
Fuensanta Saura Igual wrote:
>Dear all,
>Does anyone know how to read files with .dbf extension?
>
>Thanks for your time.
>
>______________________________________________
>R-help at 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
>
>
--
Spencer Graves, PhD, Senior Development Engineer
O: (408)938-4420; mobile: (408)655-4567
I believe .dbf files are more commonly DBase files, in which case see package RODBC. On Mon, 13 Sep 2004, Spencer Graves wrote:> Did you do a search at "www.r-project.org" -> "R site search"? > Searching for ".dbf" there just now exposed a "read.shape" function in > the maptools package. > > hope this helps. > p.s. Did you read the posting guide! > "http://www.R-project.org/posting-guide.html"? Tips provided there may > help you answer questions like this for yourself. Failing that, they > may also help you formulate your questions so you are more likely to get > useful replies. Buena suerte. > > Fuensanta Saura Igual wrote: > > >Dear all, > >Does anyone know how to read files with .dbf extension? > > > >Thanks for your time. > > > >______________________________________________ > >R-help at 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 > > > > > >-- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595