[R] Plotting the correlation
Sasha Pustota
popgen at gmail.com
Wed Apr 26 02:19:37 CEST 2006
Suppose I compute a correlation matrix ...
r <- cor(log(rbind(iris3[,,1], iris3[,,2], iris3[,,3])))
and then want to plot the values in color, e.g.
image(r, col = terrain.colors(200))
Why the matrix in the plot is rotated? The diagonal Rii=1 goes from
the bottom left to the upper right corner.
Is there a way to plot the color values in the same orientation as the
correlation matrix below? -
> print.table(r, digits=2)
Sepal L. Sepal W. Petal L. Petal W.
Sepal L. 1.00 -0.11 0.84 0.80
Sepal W. -0.11 1.00 -0.47 -0.45
Petal L. 0.84 -0.47 1.00 0.97
Petal W. 0.80 -0.45 0.97 1.00
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