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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92983] Re: [mg92968] Is there a simple way to transform 1.1 to 11/10?
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Wed, 22 Oct 2008 05:37:01 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

myRationalize[x_, n_Integer] := 
 Round[x*10^n]/10^n

x = 1.000000001;

myRationalize[x, 9]

1000000001/1000000000


Bob Hanlon

---- Alain Cochard <alain 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


--

Bob Hanlon



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