Re: position of matrix elements for intervals
- To: mathgroup at smc.vnet.net
- Subject: [mg78439] Re: position of matrix elements for intervals
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Mon, 2 Jul 2007 06:41:20 -0400 (EDT)
- Organization: The Open University, Milton Keynes, UK
- References: <f68491$eqh$1@smc.vnet.net>
kristoph wrote: > Hi, > > Assume you have the following table: > > {{1, 1.`, 0.9999999932328848`}, {1.`, 0.9985849617864345`, > 3.7570598417296495`*^-108}, {0.9999999999267634`, > 4.0643593704937925`*^-207, 0}} > > I would like the position of all the elements >= 0.99. Or the position > of all the elements of [0.4, 0.9] which in the above table does make a > lot of sense. > I'm familiar with Position[...,.] but since I look for reals of an > interval I would kindly ask for help. > > Thanks a lot, > Kristoph Hi Kristoph, You could use interval arithmetic as in the following example: In[1]:= data = {{1, 1., 0.9999999932328848}, {1., 0.9985849617864345, 3.7570598417296495*^-108}, {0.9999999999267634, 4.0643593704937925*^-207, 0}}; Position[data, x_ /; IntervalMemberQ[ Interval[{4/10, 10/10}], x]] Out[2]= {{1, 1}, {1, 2}, {1, 3}, {2, 1}, {2, 2}, {3, 1}} HTH, Jean-Marc