# Re: [R] Overlaying the matrices

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>
Date: Mon, 09 Jun 2008 13:48:56 +0200

try this:

x1 <- matrix(NA, 6, 6,

dimnames = list(letters[1:6], LETTERS[1:6])) x2 <- matrix(rpois(9, 1), 3, 3,

dimnames = list(c("b","a","f"), c("D","E","F")))

x1[rownames(x2), colnames(x2)] <- x2
x1

I hope it helps.

Best,
Dimitris

Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven

```Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm

```
• Original Message ----- From: "Shubha Vishwanath Karanth" <shubhak_at_ambaresearch.com> To: <r-help_at_stat.math.ethz.ch> Sent: Monday, June 09, 2008 1:26 PM Subject: [R] Overlaying the matrices

> Hi R,
>
>
>
> I have a matrix,
>
>
>
>> x1=matrix(NA,6,6,dimnames=list(letters[1:6],LETTERS[1:6]))
>
>> x1
>
> A B C D E F
>
> a NA NA NA NA NA NA
>
> b NA NA NA NA NA NA
>
> c NA NA NA NA NA NA
>
> d NA NA NA NA NA NA
>
> e NA NA NA NA NA NA
>
> f NA NA NA NA NA NA
>
>
>
>> x2=matrix(rpois(9,1),3,3,dimnames=list(c("b","a","f"),c("D","E","F")))
>
>> x2
>
> D E F
>
> b 0 3 0
>
> a 2 2 1
>
> f 1 0 0
>
>
>
>
>
> I need to put the values of x2 in the corresponding elements of x1.
> So
> then, x1 would look like:
>
> A B C D E F
>
> a NA NA NA 2 2 1
>
> b NA NA NA 0 3 0
>
> c NA NA NA NA NA NA
>
> d NA NA NA NA NA NA
>
> e NA NA NA NA NA NA
>
> f NA NA NA 1 0 0
>
>
>
>
>
>
>
> What would be the best way to do this?
>
>
>
> Many Thanks,
>
> Shubha
>
>
>
>
>
> This e-mail may contain confidential and/or privileged
> i...{{dropped:13}}
>
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