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>