Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*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 2004

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

Search the Archive

Delete problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52871] Delete problem
  • From: Todd Allen <genesplicer28 at yahoo.com>
  • Date: Wed, 15 Dec 2004 04:26:54 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi everyone,
 
    I have situation where I am trying to quality
control check a "list of lists" for certain values
that should be deleted from the list if they are
found.  I have wrote a few lines of code that I
believe should work, but rather than simply deleting a
part of the list,  mathematica seems to delete the
entire list.  Below is the situation with a small test
dataset:
 
masterlist={{{AEST-01-C-10,1,1,1,2,31,1,C,-2.14},{AEST-01-C-10,1,1,1,4,31,1,
     
C,-1.1},{AEST-01-C-10,2,2,1,2,12,2,C,1.79}},{{AEST-07-E-04,2,1,2,1,10,2,
     
C,1.334},{AEST-07-E-04,2,1,3,2,1,4,C,1.997},{AEST-07-E-04,3,2,1,1,2,1,
      C,-1.17},{AEST-07-E-04,3,4,1,1,21,2,C,2.15}}};
 
index=1;ccheck=Sign[masterlist[[index,All,9]]];While[
  index<=Length[masterlist],
  If[Count[ccheck,_?Positive]>0 &&
Count[ccheck,_?Negative]>0 &&
     
Count[ccheck,_Integer]==3,masterlist=Delete[masterlist,index],index++]];
 
 
I am trying to delete lists that have both positive
and negative values in the ninth position of common
elements and also have only 3 members of that group. 
For example, I would expect mathematica to delete the
first group of masterlist above, because it has three
subgroups of AEST-01-C-10 and it has the values of
-2.14, -1.1and 1.79 in each of the three AEST-01-C-10
elements.  Sorry if I have badgered the proper use of
list/grouping terminology, but hopefully my general
idea is clear.
 
Thank you for any thoughts you might have.
 
Best regards,
Todd




		
__________________________________ 
Do you Yahoo!? 
Yahoo! Mail - Helps protect you from nasty viruses. 
http://promotions.yahoo.com/new_mail


  • Prev by Date: Re: problem getting the area under a parmetric curve
  • Next by Date: Two DatabaseLink issues
  • Previous by thread: Re: Suse 9.2 + mathematica 5.0 problem (SOLVED)
  • Next by thread: Re: Delete problem