[R] R: plotting values on graphics

[Uwe Ligges]

> "joseph d. hughes" wrote:
> 
> Everyone,
> 
> I have an array of integer values which are located on a uniform 2-D
> grid.  I want to plot the integer values at the node locations. The
> closest I have come is with the following code:
> 
> for (i in 1:ny) {
>   for (j in 1:nx) {
>   ncell <- nx*(i - 1) + j
>   ch <- as.character(ncount[ncell])
>   tx <- j*dx - dx/2
>   ty <- ny*dy - (i-1)*dy - dy/2
>   points(tx, ty, pch = ch, col = "red", bg = "yellow", cex = 3)
>   }
> }

Try 
  text(tx, ty, label = ch, col = "red", bg = "yellow", cex = 3)
instead of points(...).
If you specify pch, only the first character is taken as the symbol for
your point.

Remark: It should be possible to vectorize your code. That will make it
much faster.

> The problem with the code above is I only get a one character symbol
> at each node (e.g. n=123 gives me 1 on the screen).  Is there
> something wrong with my as.character or points function calls?  Is
> there a better way to do this?

Uwe Ligges
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