*To*: mathgroup@smc.vnet.net*Subject*: [mg10594] Re: List Manipulation*From*: Daniel Lichtblau <danl@wolfram.com>*Date*: Mon, 26 Jan 1998 04:42:25 -0500*Organization*: Wolfram Research, Inc.*References*: <69nbfq$89h@smc.vnet.net>

Paul.Hanson@colorado.edu wrote: > > Hola! > Hope you're all doing well. If I have a list of n lists, and want to > get rid of all the even ones how would I go about doing this? That > is, {{n1},{n2},.....{2n}} converted to {{n1},{n3}...{2n-1}}. I tried > using the various procedures in Wolfram's book, but nothing seems to > work (ie, Delete, Take, etc.). Thanks for the help. > > Paul Hanson > > -- > * * > * * > /\ */\* > / \ / \ /\ One efficient way is to create a new list with Table. list = {{a},{b,c},{d},{e,f,g},{h,a},{k,l,{m,n}},{o,p,q}}; In[6]:= Table[list[[2*j-1]], {j,Quotient[Length[list]+1,2]}] Out[6]= {{a}, {d}, {h, a}, {o, p, q}} or In[7]:= Table[list[[j]], {j,1,Length[list],2}] Out[7]= {{a}, {d}, {h, a}, {o, p, q}} Daniel Lichtblau Wolfram Research