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)
--
To reply via email subtract one hundred and four