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MathGroup Archive 2002

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Re: Length and Drop

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32191] Re: [mg32183] Length and Drop
  • From: BobHanlon at aol.com
  • Date: Sat, 5 Jan 2002 00:10:28 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 1/4/02 5:31:06 AM, stevebg at adelphia.net writes:

>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
>dropped?

No.   With your second statement you re-defined timexp, with your fourth 
statement you did not.


Bob Hanlon
Chantilly, VA  USA


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