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
|