Extracting explicit higher derivative terms from a list

[Sukruti]

Hi,

Given a list of terms which are functions of some variables, how to extract those terms from the list which have explicit second or higher order derivatives in them?

I am looking for a solution specifically for the kind of terms shown in the attached notebook.

Cheers

Sukruti

[Thomas Bäckdahl]

Hi!

Try
Select[list1, Not@FreeQ[#, CD[_][CD[_][_]]] &]

Regards
Thomas

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[Sukruti]

Hi,

This does the job. Thanks!

Cheers

Sukruti