Re: List Position
- To: mathgroup at smc.vnet.net
- Subject: [mg15815] Re: List Position
- From: JOERG SCHLICHTMANN <joerg.schlichtmann at ruhr-uni-bochum.de>
- Date: Fri, 12 Feb 1999 18:39:38 -0500 (EST)
- Organization: Ruhr-Universitaet Bochum, Rechenzentrum
- References: <79eagc$9ig@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Harry flynn schrieb:
>
> Can anyone tell me how I find the position in a list of the first
value
> less than or equal to zero.
> For example, how can I get Mathematica to tell me that in the list
> {{1},{1},{2},{8},{-3}}
> that the first value of interest to me is position 5. Thanks in
advance.
> Harry.
What about this:
e.g. the list l:
l={{1},{1},{2},{8},{-3},{4},{-1},{0}};
finding the element {-3} functions as follows:
i=1;While[i<Length[l],
If[l[[i,1]]<=0,{Print[l[[i]]," at Position ", i],i=Length[l]+1},i++]]
wr
Joerg