[R] par(mfrow) for heatmap plots

[Brian Smith]

Hi,

I was trying to use par(mfrow) to put 4 heatmaps on a single page. However,
I get one plot per page and not one page with 4 plots. What should I
modify? Test code is given below:

test = matrix(rnorm(60), 20, 3)

pdf(file='test.pdf',width=10,height=8)
par(mfrow=c(2,2))
heatmap(test)
heatmap(test)
heatmap(test)
heatmap(test)
dev.off()

thanks!

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