[R] subscripted assignment of grid units

[pbarros]

Hi,

I want to do subscripted assignment of grid units, but I cannot find a
straightforward way of doing it (and I have searched all forums and places I
could think about, including Paul Murrell,s page). The usual subscripted
assignment operator does replace the numeric part, but does not update the
attributes. Before I write my own function, manipulating attributes etc I
would like to know if such a function already exists (I am sure it does).
What I want to do can be reflected as in the code below:

 testUnit <- unit(1, "lines")
> testUnit
[1] 1lines
> testUnits <- rep(testUnit, 5)
> testUnits
[1] 1lines 1lines 1lines 1lines 1lines
> testUnit2 <- unit(0.5, "grobwidth", textGrob("Testing"))
> testUnits[3] <- testUnit2
> testUnits
[1] 1lines   1lines   0.5lines 1lines   1lines 

I would like to obtain
[1] 1lines   1lines   0.5grobwidth 1lines   1lines 

Any tips?

Thanks,
Pedro
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