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