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