[R] Symbolic substitution of expressions into expressions

[Peter Dalgaard BSA]

John Maindonald <john.maindonald at anu.edu.au> writes:

> Setting my.y = qx2 places the latexed version of x^2
> into the text string and hence on the graph, while 
> my.y=quote(tx2) places "expression(x^2)" into the
> text string.  Is there any way to get from 
> expression(x^2) or the text string "x^2" to quote(x^2)?

Yes, 

quote(x^2) == expression(x^2)[[1]] == parse(text="x^2")[[1]]

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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