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  • $\begingroup$ der[i_, x_] := D[tf1[i, x], x] worked for me? $\endgroup$ Commented Apr 6, 2017 at 16:35
  • $\begingroup$ If tf1 has a first variable, you should define it as: tf1[myname_?String, x_] and define the specific functions for myname = "a" and "b". $\endgroup$ Commented Apr 6, 2017 at 16:36
  • $\begingroup$ @Pillsy perfect, this seems like the only combination I didn't try... (I was mostly trying pure functions as the argument). Thanks! $\endgroup$ Commented Apr 6, 2017 at 16:39
  • $\begingroup$ @DavidG.Stork this is unrelated to the derivative, but a short example would help me a lot. And maybe a hint why this is better than my way. Thank you very much! $\endgroup$ Commented Apr 6, 2017 at 16:40
  • $\begingroup$ @Pillsy however, your solution doesn't work for der["a",3], for example. There's an error "General::ivar" $\endgroup$ Commented Apr 6, 2017 at 16:50