Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1999
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive

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


  • Prev by Date: Re: I am looking for code to READ DXF files in Mathematica
  • Next by Date: Re: Using Mathem.. to learn calculus? or Statistics?
  • Previous by thread: Re: List Position
  • Next by thread: Re: How to fix bad EPS output from Display[.., .., "EPS"]