Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

Deleting expressions containing a certain head

• To: mathgroup at smc.vnet.net
• Subject: [mg125994] Deleting expressions containing a certain head
• From: Brentt <brenttnewman at gmail.com>
• Date: Wed, 11 Apr 2012 18:22:13 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hello, I have a list of expressions, and I am trying to use DeleteCases to
delete expressions in the list which contain a certain head *anywhere* in
the expression. Setting the levelspec for DeleteCases to Infinity almost
works, except I want to delete the entire expression containing the head
from the list as opposed to just the head itself while leaving the rest of
the expression in the list.

e.g.
I want this
DeleteCases[{2^(Complex[2,3])+3 , 2 ,3x }, Complex[_,_], Infinity ]

to output this
{2,3x}
Getting rid of any expression that has a complex number in it.

 How does one go about this?

• Follow-Ups:
  • Re: Deleting expressions containing a certain head
    • From: Bob Hanlon <hanlonr357@gmail.com>