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MathGroup Archive 2002

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Re: Length and Drop

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32186] Re: Length and Drop
  • From: "Mikael Persson" <lillpele79 at hotmail.com>
  • Date: Sat, 5 Jan 2002 00:10:22 -0500 (EST)
  • References: <a13vdg$dgm$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <a13vdg$dgm$1 at smc.vnet.net>, "Steve Gray"
<stevebg at adelphia.net> wrote:

> 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]
> 

You should have timexp = Drop[timexp,1].

> Length[timexp] -> 2                    [ this is what I did not expect!]
> 
>     Should not Drop reduce the Length of the list by the amount
> dropped?
> 
> 

/Micke P


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