CAS command question

[Han]

(01-05-2017 07:31 PM)parisse Wrote:  Not sure if I understand compsystem, perhaps he is asking the unquote command that is available in Xcas but not on the Prime.
y:=3; x:=5; a:='x+unquote(y)'

If I'm not mistaken, I believe what he wants is equivalent to Maple's "uneval":

Code:

f := proc(x::uneval) x^2 end proc:
a, b := 3, 4.5:
f(a+b); // Maple returns (a+b)^2 and not 56.25