R help - Aug 2011 - display only the top-right half of a correlation matrix?

Dear all
Is there an easy way to display only one half (top-right or
bottom-left) of a correlation matrix?
> require(Hmisc)
> rcorr(as.matrix(mtcars[ , 1:4]))
       mpg   cyl  disp    hp
mpg   1.00 -0.85 -0.85 -0.78
cyl  -0.85  1.00  0.90  0.83
disp -0.85  0.90  1.00  0.79
hp   -0.78  0.83  0.79  1.00

n= 32


P
     mpg cyl disp hp
mpg       0   0    0
cyl   0       0    0
disp  0   0        0
hp    0   0   0


Since the two sides are identical, there is little value in having
both displayed at the same time. Moreover, it considerably slows down
the inspection of the results.

Thank you
Liviu



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On Fri, Aug 19, 2011 at 11:50 AM, Liviu Andronic <landronimirc at
gmail.com> wrote:
> Dear all
> Is there an easy way to display only one half (top-right or
> bottom-left) of a correlation matrix?
>
>> require(Hmisc)
>> rcorr(as.matrix(mtcars[ , 1:4]))
> ? ? ? mpg ? cyl ?disp ? ?hp
> mpg ? 1.00 -0.85 -0.85 -0.78
> cyl ?-0.85 ?1.00 ?0.90 ?0.83
> disp -0.85 ?0.90 ?1.00 ?0.79
> hp ? -0.78 ?0.83 ?0.79 ?1.00
>
Use as.dist: here's an example.
> x = matrix(rnorm(5*100), 100, 5)
> as.dist(cor(x))
              1             2             3             4
2 -2.892981e-06
3  2.873711e-02  1.002969e-02
4 -5.803705e-02  4.022733e-02 -6.154211e-02
5  1.137083e-01 -8.065676e-02 -9.279316e-02 -8.201583e-02

r-help-bounces@r-project.org wrote on 08/19/2011 01:50:48 PM:
> [image removed] 
> 
> [R] display only the top-right half of a correlation matrix?
> 
> Liviu Andronic 
> 
> to:
> 
> r-help@r-project.org Help
> 
> 08/19/2011 01:55 PM
> 
> Sent by:
> 
> r-help-bounces@r-project.org
> 
> Dear all
> Is there an easy way to display only one half (top-right or
> bottom-left) of a correlation matrix?
See ?lower.tri
> 
> > require(Hmisc)
> > rcorr(as.matrix(mtcars[ , 1:4]))
>        mpg   cyl  disp    hp
> mpg   1.00 -0.85 -0.85 -0.78
> cyl  -0.85  1.00  0.90  0.83
> disp -0.85  0.90  1.00  0.79
> hp   -0.78  0.83  0.79  1.00
> 
> n= 32
> 
> 
> P
>      mpg cyl disp hp
> mpg       0   0    0
> cyl   0       0    0
> disp  0   0        0
> hp    0   0   0
> 
> 
> Since the two sides are identical, there is little value in having
> both displayed at the same time. Moreover, it considerably slows down
> the inspection of the results.
> 
> Thank you
> Liviu
> 
Jean

`·.,,  ><(((º>   `·.,,  ><(((º>   `·.,,  ><(((º>

Jean V. Adams
Statistician
U.S. Geological Survey
Great Lakes Science Center
223 East Steinfest Road
Antigo, WI 54409  USA
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