Re: Length and Drop
- To: mathgroup at smc.vnet.net
- Subject: [mg32192] Re: [mg32183] Length and Drop
- From: Adriano Pascoletti <pascolet at dimi.uniud.it>
- Date: Sat, 5 Jan 2002 00:10:29 -0500 (EST)
- References: <200201041003.FAA13779@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
At 5:03 -0500 4-01-2002, Steve Gray 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]
>
>Length[timexp] -> 2 [ this is what I did not expect!]
>
> Should not Drop reduce the Length of the list by the amount
>dropped?
Steve,
Drop[timexp,1] does not affect timex, so its length remains 2; the
most recent output has the length you expected
Length[%] -> 1
Adriano Pascoletti
- References:
- Length and Drop
- From: "Steve Gray" <stevebg@adelphia.net>
- Length and Drop