blank upper or lower triangle of cor-matrix

-----Original Message-----
From: Christos Hatzis [mailto:christos at nuverabio.com] 
Sent: Wednesday, February 07, 2007 2:16 PM
To: 'Leo G?rtler'; 'r-help at stat.math.ethz.ch'
Subject: RE: [R] blank upper or lower triangle of cor-matrix

You can try

as.dist(d)


Christos Hatzis, Ph.D.
Nuvera Biosciences, Inc.
400 West Cummings Park
Suite 5350
Woburn, MA 01801
Tel: 781-938-3830
www.nuverabio.com
 
 

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch 
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Leo G?rtler
Sent: Wednesday, February 07, 2007 1:36 PM
To: r-help at stat.math.ethz.ch
Subject: [R] blank upper or lower triangle of cor-matrix

Dear altogether,

I want to blank the lower (or upper) part of a correlation 

matrix as 

it is done by dist()

example:

( d <- cor(matrix(runif(12),nrow=4)) )

If I do the following

d[lower.tri(d)] <- ""

of course everything is changed to character - that's not 

what should 

be.
Additionally, it does not work to assign "0" or anything else. The 
same is true for assigning "NA".

However, what I want is like the following:

( dist(matrix(runif(12),nrow=4)) )

Looking into dist(), it seems that the calculation and the 

matrix are 

done in C and not in plain R.

How can I realize it?

thanks!

best,

leo