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

*To*: mathgroup at smc.vnet.net*Subject*: [mg93008] Re: [mg92968] Is there a simple way to transform 1.1 to 11/10?*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>*Date*: Wed, 22 Oct 2008 05:41:40 -0400 (EDT)*References*: <200810211024.GAA04964@smc.vnet.net>

I think this will do it: ff[z_] := With[{w = RealDigits[z]},FromDigits[MapAt[# /. {x___, a_ /; a != 0, 0 ...} :> {x, a} &, w, 1]]] for example: ff[1.01101] 101101/100000 ff[1.000000001] 1000000001/1000000000 etc. Andrzej Kozlowski On 21 Oct 2008, at 19:24, Alain Cochard 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 >

**References**:**Is there a simple way to transform 1.1 to 11/10?***From:*Alain Cochard <alain@geophysik.uni-muenchen.de>