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...;- 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...