Selecting Lists Without Null Results
- To: mathgroup at smc.vnet.net
- Subject: [mg68970] Selecting Lists Without Null Results
- From: Gregory Lypny <gregory.lypny at videotron.ca>
- Date: Sat, 26 Aug 2006 02:03:52 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
I must be doing something wrong as usual. How come I can select
list with elements that have the word Null in them as a result of a
computation, but I cannot exclude them?
I have an array called runsTable with 179 rows, and there are five
rows with Null in column 14.
Length[Select[runsTable, #[] == Null &]
Length[Select[runsTable, (#[]¬ Null) &]]
returns 0 when it should return 174, that is, 179 minus 5.
Am I using the NOT operator incorrectly?
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