RE: Re: MemberQ
- To: mathgroup at smc.vnet.net
- Subject: [mg68599] RE: [mg68561] Re: MemberQ
- From: "Erickson Paul-CPTP18" <Paul.Erickson at Motorola.com>
- Date: Fri, 11 Aug 2006 04:40:14 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Only curious if for you .7//FullForm doesn't return 0.7000000000000001` -----Original Message----- From: leigh pascoe [mailto:leigh at cephb.fr] To: mathgroup at smc.vnet.net Subject: [mg68599] [mg68561] Re: MemberQ Adriano Pascoletti wrote: > 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? >> >> Thankx. >> >> Bruce >> >> > > Because the 0.7 in Range[0.0, 1.0, 0.1] is > > In[11]:= > Range[0.0,1.0,0.1][[8]]//FullForm > Out[11]//FullForm= > 0.7000000000000001` > > and > > In[9]:= > FullForm[0.7] > Out[9]//FullForm= > 0.7` > > They differ on the 16th decimal place as can be seen evaluating > 0.7 - Range[0.0, 1.0, 0.1] > > > > Adriano Pascoletti > > > > So the curious thing is that it returns True for Ssezi and for me! In[8]:=Range[0.,1.,.1][[8]]//FullForm MemberQ[Range[0.,1.,.1],.7] Out[8]//FullForm=0.7000000000000001` Out[9]=True LP