Re: Length and Drop

*To*: mathgroup at smc.vnet.net*Subject*: [mg32191] Re: [mg32183] Length and Drop*From*: BobHanlon at aol.com*Date*: Sat, 5 Jan 2002 00:10:28 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

In a message dated 1/4/02 5:31:06 AM, stevebg at adelphia.net writes: >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? No. With your second statement you re-defined timexp, with your fourth statement you did not. Bob Hanlon Chantilly, VA USA