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MathGroup Archive 2002

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Length and Drop

  • To: mathgroup at
  • Subject: [mg32183] Length and Drop
  • From: "Steve Gray" <stevebg at>
  • Date: Fri, 4 Jan 2002 05:03:59 -0500 (EST)
  • Sender: owner-wri-mathgroup at

    The following sequence seems wrong to  me, in that
after dropping some elements from a list, its Length is
still the same. I copied this directly from the notebook
but removed the In[] and Out[] statements.

timexp={{0,0}} -> {{0,0}}        [this is ok]

timexp=Append[timexp,{7,8}] -> {{0,0},{7,8}}       [this is ok]

Length[timexp] -> 2             [this is ok]

Drop[timexp,1] -> {{7,8}}         [this is ok]

Length[timexp] -> 2                    [ this is what I did not expect!]

    Should not Drop reduce the Length of the list by the amount

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