Test which symbol of a list depend on some variable

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Asked 6 years, 10 months ago

Modified 6 years, 10 months ago

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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:

{y[x],z[x]}

and {k}

Thanks in advance

asked Jan 30, 2017 at 7:27

jrekier

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2

$\begingroup$ Have you seen FreeQ[]? $\endgroup$
– J. M.'s eventual burnout ♦
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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