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MathGroup Archive 2007

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Just one "1" in a list

  • To: mathgroup at
  • Subject: [mg78140] Just one "1" in a list
  • From: Diana <diana.mecum at>
  • Date: Sat, 23 Jun 2007 07:22:02 -0400 (EDT)

Math folks,

Can someone tell me what command I would use to pick out sublists
which contain just one "1"?

For example, if I have the following list,

{{1,2}, {1,3}, {2,3}, {2,1}, {1,1,2}, {1,2,2}, {2,1}},

I would like to just pull the terms,

{{1,2}, {1,3}, {2,1}, {1,2,2}, {2,1}}.

Can someone help? Thanks, Diana M.

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