Given a list of symbols, say {y[x],z[x],k}

Is there a way to sort which depend on x and which don't ? Applied to the above list, the method would give:


and {k}

Thanks in advance

  • 2
    $\begingroup$ Have you seen FreeQ[]? $\endgroup$ Jan 30, 2017 at 7:29
  • $\begingroup$ Consider also GatherBy[]. $\endgroup$
    – Kiro
    Jan 30, 2017 at 7:32
  • $\begingroup$ I guess FreeQ[#, x] & /@{y[x], k, x} could be enough for what I have in mind. Although, is there a way to explicitly check for [x]'s presence and rather than x ? $\endgroup$
    – jrekier
    Jan 30, 2017 at 7:33
  • 2
    $\begingroup$ @jrekier _[x]. $\endgroup$
    – Kuba
    Jan 30, 2017 at 7:43
  • 1
    $\begingroup$ @Kuba Will this pick f[x,z] also? It gets tricky? Function that depends on x and other variables? $\endgroup$
    – Nasser
    Jan 30, 2017 at 7:46


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