Francisco, 
  Thank you so much. It´s more than I need. 
  You help was of great value.
   
  Kind regards,
   
  Miltinho

"Francisco J. Zagmutt" <gerifalte28@hotmail.com> escreveu:
  Oi Milton,

Is this what you are after?

x=read.table("miltondat.txt")
>x
V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
1 0 0 0 0 0 0 0 0 0 0
2 0 0 0 0 0 1 1 1 0 0
3 0 0 0 0 0 1 1 1 0 0
4 0 0 0 0 0 0 0 0 0 0
5 0 0 2 2 2 0 0 0 0 0
6 0 0 0 2 2 2 0 0 0 0
7 0 0 2 2 2 2 2 2 0 0
8 0 0 0 0 0 0 0 0 0 0

idx=which(x==2,arr.ind=T) #Index of observations with values == 2 . Notice 
the use of arr.ind=t to get the rows and columns of the observations

>idx
row col
5 5 3
7 7 3
5 5 4
6 6 4
7 7 4
5 5 5
6 6 5
7 7 5
6 6 6
7 7 6
7 7 7
7 7 8

>range(idx[,"row"]) #gives you the min and max of the rows with x==2
[1] 5 7
>range(idx[,"col"])#gives you the min and max of the columns with x==2
[1] 3 8


You can refine this and wrap it in a function to make reports in a more 
suitable form

Regards

Francisco

Dr. Francisco J. Zagmutt
College of Veterinary Medicine and Biomedical Sciences
Colorado State University




>From: Milton Cezar Ribeiro 
>To: r-help@stat.math.ethz.ch
>Subject: [R] identify extremes positions of values into matrix
>Date: Fri, 3 Nov 2006 11:25:32 -0300 (ART)
>
>Hi R-friends around world!
> I have a matrix that looks like bellow one.
>Each cell are filled with values 0, 1 or 2.
>In fact I have a lot of 512x512 matrices, with
>values varying from 0 to 999.
> I need to retrieve the left and right columns
>and the top and botton lines of the matrix
>where occours for example the value 2.
>Column and row labels are included at the example.
>
> 1234567890
>1 0000000000
>2 0000011100
>3 0000011100
>4 0000000000
>5 0022200000
>6 0002220000
>7 0022222200
>8 0000000000
>
> At this example, the right answer are:
> collumns 3 and 8
> lines 5 and 7
> Any idea of how can I solve this?
> Kind regards,
> Miltinho
>
>
>---------------------------------
>
> Música para ver e ouvir: You're Beautiful, do James Blunt
> [[alternative HTML version deleted]]
>


>______________________________________________
>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
>and provide commented, minimal, self-contained, reproducible code.

_________________________________________________________________
Try Search Survival Kits: Fix up your home and better handle your cash with 
Live Search! 
http://imagine-windowslive.com/search/kits/default.aspx?kit=improve&locale=en-US&source=hmtagline



 		
---------------------------------

 Música para ver e ouvir: You're Beautiful, do James Blunt
	[[alternative HTML version deleted]]

