Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2005
*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 2005

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

Search the Archive

Re: SameTest in Union

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61123] Re: SameTest in Union
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 11 Oct 2005 03:20:14 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <did38g$qht$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

lst = {1.1101, 1.11095, 1.11076, 1.09, 2.3523, 
2.352, 2.35211};

Union[ lst, SameTest -> (Abs[#1 - #2] < 0.025 &)]


Gruß

  Jens



"Jack Goldberg" <jackgoldberg at comcast.net> schrieb 
im Newsbeitrag news:did38g$qht$1 at smc.vnet.net...
| Hi Folks,
|
| I know there is a simple answer to this question 
but the help index
| idoes not help!
|
| I have a list, something like this:
|
| lst = {1.1101, 1.11095, 1.11076, 1.09, 2.3523, 
2.352. 2.35211}
|
| I want to remove from the list those entries 
which are near each
| other but not identical, leaving only one 
representative for each of
| these numbers.  One approach is to use  Union 
with the option
| SameTest->???.   Here the same test might be 
that the difference
| between entries is less than, say 10^(-2).   But 
I can't seem to get
| SameTest to work.  So, what I want is
|
| Union[ lst, SameTest- > ?]
|
| so that  the union returns
|
| {1.1101,  2.35211}
|
| Here, I chose 2 representatives.  Any other 
choice is OK;   say,
|
| {1.11095,  2.352}
|
| is also satisfactory.
|
| There may be other ways to do this, but I 
thought of  Union  first.
| Perhaps, Cases  or Select  might be better.  Any 
help is appreciated.
|
| Jack
| 



  • Prev by Date: Re: SameTest in Union
  • Next by Date: Compile SparseArray help
  • Previous by thread: Re: SameTest in Union
  • Next by thread: Re: SameTest in Union