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
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