R help - Sep 2010 - lower triangle of the correlation matrix with xtable

Dear all,

mydata<-data.frame(x1=c(1,4,6),x2=c(3,1,2),x3=c(2,1,3))
cor(mydata)
           x1         x2        x3
x1  1.0000000 -0.5960396 0.3973597
x2 -0.5960396  1.0000000 0.5000000
x3  0.3973597  0.5000000 1.0000000

I wonder if it is possible to fill only lower triangle of this
correlation matrix? Using 'dist' doesn't seem to be useful as it
doesnt
allow to convert this table with xtable. 

print(xtable(cor(mydata),digits=3))

Any ideas?
Cheers,
Olga

Like this?
> mydata<-data.frame(x1=c(1,4,6),x2=c(3,1,2),x3=c(2,1,3))
> as.dist(cor(mydata))
           x1         x2
x2 -0.5960396
x3  0.3973597  0.5000000

Sarah

On Thu, Sep 2, 2010 at 9:51 AM, Olga Lyashevska <olga at herenstraat.nl>
wrote:
> Dear all,
>
> mydata<-data.frame(x1=c(1,4,6),x2=c(3,1,2),x3=c(2,1,3))
> cor(mydata)
> ? ? ? ? ? x1 ? ? ? ? x2 ? ? ? ?x3
> x1 ?1.0000000 -0.5960396 0.3973597
> x2 -0.5960396 ?1.0000000 0.5000000
> x3 ?0.3973597 ?0.5000000 1.0000000
>
> I wonder if it is possible to fill only lower triangle of this
> correlation matrix? Using 'dist' doesn't seem to be useful as
it doesnt
> allow to convert this table with xtable.
>
> print(xtable(cor(mydata),digits=3))
>
> Any ideas?
> Cheers,
> Olga
>


-- 
Sarah Goslee
http://www.functionaldiversity.org

try lower.tri

and see

??lower.tri

Steve Friedman Ph. D.
Spatial Statistical Analyst
Everglades and Dry Tortugas National Park
950 N Krome Ave (3rd Floor)
Homestead, Florida 33034

Steve_Friedman at nps.gov
Office (305) 224 - 4282
Fax     (305) 224 - 4147


                                                                           
             Olga Lyashevska                                               
             <olga at herenstraat
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             09/02/2010 09:51          [R] lower triangle of the           
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Dear all,

mydata<-data.frame(x1=c(1,4,6),x2=c(3,1,2),x3=c(2,1,3))
cor(mydata)
           x1         x2        x3
x1  1.0000000 -0.5960396 0.3973597
x2 -0.5960396  1.0000000 0.5000000
x3  0.3973597  0.5000000 1.0000000

I wonder if it is possible to fill only lower triangle of this
correlation matrix? Using 'dist' doesn't seem to be useful as it
doesnt
allow to convert this table with xtable.

print(xtable(cor(mydata),digits=3))

Any ideas?
Cheers,
Olga

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