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A simple example about what I need to do. For example, I have three functions:

t1[x,t]
t2[x,t]
t3[x,t]

and,

t3[x_,t_]:=t1[x,t]+t2[x,t]

What is the best way to create a function t4[x,t] that is numerically "equal" to t3[x,t] but is not function of t1[x,t] and t2[x,t] in order to avoid a circular reference in a While loop program?

Regards!

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t4[x_,t_]:=Evaluate[t1[x,t]+t2[x,t]]
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    $\begingroup$ Or equivalently just use Set ( = ) rather than SetDelayed ( := ) in the definition of t3. $\endgroup$
    – Bob Hanlon
    Aug 8, 2014 at 14:15
  • $\begingroup$ Thanks. Interesting... if for example t1[x,t] is a interpolation function (came from NDSolve), I have to declare t4[x_?NumericQ,t_?NumericQ]:=Evaluate[t1[x,t]+t2[x,t]]. Still testing... $\endgroup$
    – Luis Fernando Moura
    Aug 8, 2014 at 15:01

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