[R] curvedarrow (some graphics problem)

[casperyc]

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>  grid.text("t", x=0.3, y=unit(-1, "line"), vp=vp2)
Error in valid.units(units) : Invalid unit
>  grid.text("s", 0.8, unit(-1, "line"), gp=gpar(col="red"), vp=vp2) 
Error in valid.units(units) : Invalid unit

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Hi,

I have loaded the [grid] package. It seems that I have to load another
package?

Thanks
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