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  • $\begingroup$ Without any insight into the code, for example what f is, we can not help you. For example, maybe f can be defined with Set instead of SetDelayed. You can always h[x_,y_]=f[x,y] and then work on h with g. $\endgroup$ Commented Aug 10, 2013 at 8:32
  • $\begingroup$ @Kuba, when use h in g, then when I evaluate g, would f will be evaluated? $\endgroup$ Commented Aug 10, 2013 at 8:35
  • $\begingroup$ @andre: Sorry for my typo in the post, but what I mean is that g[x_, y_] := ...f[x,y], not g[x_, y_] =: .... But thank you for your reply, because I don't know the difference between := and =. Would you mind explain a bit or a source? $\endgroup$ Commented Aug 10, 2013 at 8:50
  • $\begingroup$ about = and := there is reference.wolfram.com/mathematica/tutorial/… $\endgroup$ Commented Aug 10, 2013 at 9:11