[R] Flipping a heatmap

[David Khabie-Zeitoune]

Hi

I am using the heatmap function in package mva to look at large
correlation matrices visually.
Is there any way to "flip" the output of heatmap plot left-right so
that, if presented with a correlation matrix, it plots the unity
elements in the correlation matrix along a diagonal from top left to
bottom right?

For example:

library(mva)
x = matrix(rnorm(1000), ncol=10)
z = cor(x)
heatmap(z)

Heatmap calls image, and I've found ways to do it with image e.g:

image(z[1:10,10:1]) 

will plot things the "right" way round, but

heatmap(z[1:10,10:1]) 

does not.

Any help much appreciated.
Cheers,
Dave