R help - Mar 2010 - abline on heatmap

Hi,

Is there a way I can draw an abline on a heatmap? I try the abline function, but
don't get the line. My sample code is:
mat <- matrix(sample(1:100,40),nrow=5)
heatmap(mat,col=greenred(75),trace="none",
dendrogram = "column",labCol = NULL)
abline(h=5,v=4)


thanks!


      
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You can use abline, but heatmap rescales the x and y coordinates to
min of 0, max of 1. You can use the max x and y values to find the
desired location for the line.

Sarah

On Sat, Mar 20, 2010 at 4:02 PM, Tim Smith <tim_smith_666 at yahoo.com>
wrote:
> Hi,
>
> Is there a way I can draw an abline on a heatmap? I try the abline
function, but don't get the line. My sample code is:
> mat <- matrix(sample(1:100,40),nrow=5)
> heatmap(mat,col=greenred(75),trace="none",
> dendrogram = "column",labCol = NULL)
> abline(h=5,v=4)
>
>
> thanks!
>
-- 
Sarah Goslee
http://www.functionaldiversity.org