R help - Jul 2007 - getting values from arrays using which()

Dear R-Help,

I have an array 1260x1260, upper triangle consisting of numbers between 0 and
100, and lower triangle all NA. I can extract the index of those values say
above 99 using the following code:
which(myArray>=99 , ind.arr=T)

which returns:
       row  col
5475   252  253
45423  764  765
46902  777  778
34146  611  962
50681 1220 1221

Now I would like to if poss print the actual value contained in the index as
well so it would look like:

       row  col
5475   252  253    99  
45423  764  765    96.5    
46902  777  778    99
34146  611  962    100    
50681 1220 1221    100

Can this be done?


      ___________________________________________________________ 


	[[alternative HTML version deleted]]

ndx <- which(myArray>=99 , ind.arr=T)

cbind(ndx, myArray[ndx])



Best regards

Frede Aakmann T?gersen
Scientist


UNIVERSITY OF AARHUS
Faculty of Agricultural Sciences
Dept. of Genetics and Biotechnology
Blichers All? 20, P.O. BOX 50
DK-8830 Tjele

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Direct:  +45 8999 1878

E-mail:  FredeA.Togersen at agrsci.dk
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Med venlig hilsen
Frede Aakmann T?gersen
 

 
> -----Oprindelig meddelelse-----
> Fra: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] P? vegne af Jabez Wilson
> Sendt: 5. juli 2007 12:21
> Til: R-Help
> Emne: [R] getting values from arrays using which()
> 
> Dear R-Help,
> 
> I have an array 1260x1260, upper triangle consisting of 
> numbers between 0 and 100, and lower triangle all NA. I can 
> extract the index of those values say above 99 using the 
> following code:
> which(myArray>=99 , ind.arr=T)
> 
> which returns:
>        row  col
> 5475   252  253
> 45423  764  765
> 46902  777  778
> 34146  611  962
> 50681 1220 1221
> 
> Now I would like to if poss print the actual value contained 
> in the index as well so it would look like:
> 
>        row  col
> 5475   252  253    99  
> 45423  764  765    96.5    
> 46902  777  778    99
> 34146  611  962    100    
> 50681 1220 1221    100
> 
> Can this be done?
> 
> 
>       ___________________________________________________________ 
> 
> 
> 	[[alternative HTML version deleted]]
> 
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>