R help - Jan 2011 - Adding image to plotting area

Hello,

I've drawn a black rectangle over the plotting area, and when I add an
image() heatmap, it doesn't take up all the area, but is set inward from the
black rectangle. Can anyone suggest how to make it stretch out to the entire
area ?

Minimal example :

y <- matrix(runif(2000*20), nrow = 2000)
y[100:200, 10] = NA
plot.new()
usr <- par('usr')
rect(usr[1], usr[3], usr[2], usr[4], col="black")
image(t(y), add = TRUE)

Thanks,
       Dario.

On 01/28/2011 11:00 AM, Dario Strbenac wrote:
> Hello,
>
> I've drawn a black rectangle over the plotting area, and when I add an
image() heatmap, it doesn't take up all the area, but is set inward from the
black rectangle. Can anyone suggest how to make it stretch out to the entire
area ?
>
> Minimal example :
>
> y<- matrix(runif(2000*20), nrow = 2000)
> y[100:200, 10] = NA
> plot.new()
> usr<- par('usr')
> rect(usr[1], usr[3], usr[2], usr[4], col="black")
> image(t(y), add = TRUE)
>
Hi Dario,
Try this magic incantation before plotting:

par(xaxs="i",yaxs="i")

Jim