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Re: Length and Drop

• To: mathgroup at smc.vnet.net
• Subject: [mg32215] Re: Length and Drop
• From: "Steve Gray" <stevebg at adelphia.net>
• Date: Sun, 6 Jan 2002 03:38:31 -0500 (EST)
• References: <a13vdg$dgm$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

    Thanks to all who answered. I found this obvious
error soon after I made the post.

"Steve Gray" <stevebg at adelphia.net> wrote in message
news:a13vdg$dgm$1 at smc.vnet.net...
>     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?
>
>