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i have a code which gives an output of this kind:

rrr=2*f+1;

Now i define a simple function:

f[x_]:=3*x+2;
  1. How should i do if i want the variable f to be replaced by the function f[x_] ?
  2. If i want to do the inverse process: from the function f[x_] to f ?
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rrr2 = rrr /. f -> f[x]

1 + 2 (2 + 3 x)

rrr2 /. f[x] -> f

1 + 2 f

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  • $\begingroup$ ah yes using conditions, i did not try in this way. Thanks $\endgroup$
    – siderius
    Commented Oct 24, 2018 at 22:34
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    $\begingroup$ @siderius -- these are not "conditions" --- the command /. is a short form of ReplaceAll, which is exactly what you are asking for, to replace f with f[x] or vice versa. $\endgroup$
    – bill s
    Commented Oct 25, 2018 at 2:28

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