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unlessalreadydone
2014 May 01
3
How to test if an object/argument is "parse tree" - without evaluating it?
...lt;- substitute(expr)
expr
}
but it would be neat to do this without passing an extra argument. If
this is not possible to implement in plain R, can this be done
internally inspecting SEXP:s and so on? Even better would be if
substitute() could do this for me, e.g.
expr <- substitute(expr, unlessAlreadyDone=TRUE)
Any suggestions?
Thanks,
Henrik