[R] plotting a grid with grid() ?

[David Winsemius]

On Aug 24, 2009, at 4:10 PM, John Kane wrote:

> I am trying to come up with a way of shading-in a grid for a simple  
> pattern
>
> So far I can draw a square where I want but I cannot seem to draw a  
> complete grid. I am just drawing them along the diagonal!!
>
> Clearly I am missing something simple but what?
>
> Any suggestions gratefully accepted.
>
> Example
> #====================================================================
> op <-  par(xaxs="i", yaxs="i")
> plot(c(1, 11), c(1,11), type ="n", xlab="", ylab="")

  plot(c(1, 11), c(1,11), type ="n", xlab="", ylab="")
  abline(h=2:10, lty=3, col="red")
  abline(v=2:10, lty=3, col="red")

Is that what you meant be a "complete grid"?

-- 
David Winsemius, MD
Heritage Laboratories
West Hartford, CT