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MathGroup Archive 2006

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Re: MemberQ

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68536] Re: MemberQ
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Wed, 9 Aug 2006 04:19:04 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 8/8/06 at 6:28 AM, vze269bv at verizon.net (Bruce Colletti) wrote:

>Re Mathematica 5.2.0.0.

>Since 0.7 is in the set {0.0, 0.1, 0.2,..., 0.9, 1.0}, why does
>MemberQ[Range[0., 1., .1], .7] return False?

It is due to using inexact numbers, i.e.

In[22]:=
RealDigits[Range[0.,1.,.1][[8]]]

Out[22]=
{{7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},0}

but

In[23]:=
RealDigits[.7]

Out[23]=
{{7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},0}

In[24]:=
$Version

Out[24]=
5.2 for Mac OS X (June 20, 2005)
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