[R] curvedarrow (some graphics problem)

[casperyc]

baptiste auguie-4 wrote:
> 
> Hi,
> 
> Grid offers several functions to help drawing such graphs,
> 
> see Paul Murrell's "Can R Draw Graphs? " (useR! 2006)
> 
> I came up with this, as a quick example,
> 
> vp <-  viewport(
> x = unit(0, "npc"),
> y = unit(0,  "npc"),
> just = c("left", "bottom"),
> xscale = c(-1, 1) ,
> yscale = c(-1, 1))
> 
> ........
> 
> 


Hi,

I tried to do the first part. However, it returned with "no such function
'viewport' " error.

Do I have to load some package first?

And this is a lot 'more' code than I expected since I am very new to R.
It amazes me that R can be so POWERFUL!

I will try make your code work and have a look at the page you pointed out.

Thank you for you help.

Chen

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