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Re: Is there a simple way to transform 1.1 to 11/10?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92991] Re: Is there a simple way to transform 1.1 to 11/10?
  • From: amzoti <amzoti at gmail.com>
  • Date: Wed, 22 Oct 2008 05:38:28 -0400 (EDT)
  • References: <gdkajv$4r2$1@smc.vnet.net>

On Oct 21, 3:23 am, Alain Cochard <al... at geophysik.uni-muenchen.de>
wrote:
> The obvious
>
>     In[1]:= x=1.1`Infinity
>
> is not syntactically correct.
>
> I understand that SetPrecision[1.1,Infinity] does not work either:
>
>     In[3]:= SetPrecision[1.1,Infinity]
>
>             2476979795053773
>     Out[3]= ----------------
>             2251799813685248
>
>     In[4]:= N[%,20]
>
>     Out[4]= 1.1000000000000000888
>
> I searched the newsgroup and thought I had the solution with Rationalize:
>
>     In[5]:= Rationalize[1.1,0]
>
>             11
>     Out[5]= --
>             10
>
> But
>
>     In[9]:= Rationalize[1.000000001,0]
>
>             999999918
>     Out[9]= ---------
>             999999917
>
>     In[10]:= N[%,20]
>
>     Out[10]= 1.0000000010000000830
>
> So any simple way?
>
> Thanks,
> Alain

Rationalize[1.1]


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