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2008 Oct 06
0
Computing on the language redux
...;- expression(x < a) ## just the part to the right of the <- assignment
to the object
expression( x < a & y < b) ## or something like this
Phil Spector showed how to do this by essentially deparsing and reparsing
the string:
parse(text =paste(ex1, "& y < b"))
Howwever, Duncan Murdoch commented in a subsequent post that this approach
might fail under certain circumstances and that a better approach would be
to compute on the language object directly using the bquote() function:
ex1[[1]] <- bquote( .(ex1[[1]]) & y < b)
The important idea that Duncan hi...