Re: Partition a list into sublists of unequal size
- To: mathgroup at smc.vnet.net
- Subject: [mg83932] Re: Partition a list into sublists of unequal size
- From: dh <dh at metrohm.ch>
- Date: Wed, 5 Dec 2007 07:03:49 -0500 (EST)
- References: <fj37cv$hq0$1@smc.vnet.net>
Hi Anthony,
here is an example:
pos={1,4,7,8,10,15};
dat=Range[pos[[-1]]];
FoldList[(Print["ind=",{#1,#2}];Take[dat,{#1[[-1]]+1,#2}])&,{0},pos]
hope this helps, Daniel
antf wrote:
> Hello,
>
> I have a list that looks like the following:
>
> list={1,0,0,1,0,0,1,1,0,1,0,0,0,0,1,0}
>
> I then find the positions of the 1s in the list:
>
> positions = Flatten@Position[list,1]
>
> {1,4,7,8,10,15}
>
> I then want to partition a third list into sublists so that the first
> sublist is from index 1;;1, the second sublist is from index 2;;4, the
> third sublist is from index 5;;7, the fourth sublist is just element
> 8, etc.
>
> Currently, I use Partition on the positions sublist with overlap as
> in:
>
> Partition[Join[{1},positions],2,1]
>
> {{1,1},{1,4},{4,7},{7,8},{8,10},{10,15}}
>
> I then use this list to partition the target list by Mapping Take to
> each element of this list and adjusting the first index appropriately.
>
> I am sure there must be a simpler way to do this. Can anyone tell me
> how to do this operation?
>
> Thanks,
> Anthony
>