Dear R users,
I am trying to print heatmaps in a loop (with a pause).  Idea is to
visualize changing correlations over time and for testing I wrote this
simple (reproducible) code below.
My problem is that levelplot() does not produce any output when I run the
code (though heatmap does).  Ideally I would like to use levelplot() as it
produces a neat index on the side indicating the color and the correlation
value that it corresponds to while heatmap does not.  Any pointers as to
how I can make levelplot() produce output in the loop or get heatmap to
procude a nice index like levelplot() does?
ps- To see the output with heatmap in a loop, just uncomment the heatmap()
line and comment out the levelplot() line

col.l <- colorRampPalette(c('blue', 'green', 'yellow', 'red'))(30)
for (i in 1:10)
{
  randmat <- cbind(rnorm(100),rnorm(100),rnorm(100),rnorm(100),rnorm(100))
  colnames(randmat) <- c('A','B','C','D','E')
  cormat <- cor(randmat)
  levelplot(cormat,xlab=NULL,ylab=NULL,main='Correlation Heat
Map',col.regions=col.l)
#  heatmap(cormat,col=col.l,Rowv=NA, Colv=NA,main=paste("Plot:",i,sep=''))
  Sys.sleep(1)
}

Thanks much in advance!

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