[R] CORRELATION MATRIX CONVERSION

[Liaw, Andy]

Something like:

> dat <- data.frame(x=runif(10), y=runif(10), z=runif(10))
> m <- cor(dat)
> m
          x          y          z
x 1.0000000  0.1183305  0.1096394
y 0.1183305  1.0000000 -0.2819285
z 0.1096394 -0.2819285  1.0000000
> mat2col <- function(m) {
+     m2 <- matrix(m, ncol=1)
+     rownames(m2) <- outer(rownames(m), colnames(m), paste)
+     m2
+ }
> mat2col(m)
          [,1]
x x  1.0000000
y x  0.1183305
z x  0.1096394
x y  0.1183305
y y  1.0000000
z y -0.2819285
x z  0.1096394
y z -0.2819285
z z  1.0000000

Andy 

> From: Omer Bakkalbasi
> 
> How do I convert the output of cor(x) to a columnar format? 
> Ex. from format below
>     X    Y    Z
> X  1.0  0.9  0.5
> Y  0.9  1.0  0.1
> Z  0.5  0.1  1.0
> 
> to format below
> 
> X X 1.0
> X Y 0.9
> X Z 0.5
> Y X 0.9
> Y Y 1.0
> Y Z 0.1
> Z X 0.5
> Z Y 0.1
> Z Z 1.0
> 
> Thanks!
> 
> Omer
> 
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