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MathGroup Archive 2011

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Re: Help with Delete cases

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116258] Re: Help with Delete cases
  • From: "Harvey P. Dale" <hpd1 at nyu.edu>
  • Date: Tue, 8 Feb 2011 05:08:31 -0500 (EST)

Use Select instead of DeleteCases and use not-equal rather than equal:
Select[list,Mod[N - m(m+1)/2,P] !== 0]
	Best,
	Harvey


-----Original Message-----
From: KenR [mailto:ramsey2879 at msn.com]
Sent: Monday, February 07, 2011 6:06 AM
To: mathgroup at smc.vnet.net
Subject: [mg116258] [mg116223] Help with Delete cases

I have a list== Range[3003]  I want to delete cases of n == m(m+1) mod P
from the list, but Delete cases only deletes cases matching a pattern,
i.e.

list == DeleteCases[list,Mod[N - m(m+1)/2,P] == 0] will definitely not
work.  I want to keep list, as the same identifier, throughout since
this is within a looping process. Any suggestions?


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