Re: number dot (with space)

*To*: mathgroup at smc.vnet.net*Subject*: [mg99806] Re: number dot (with space)*From*: Szabolcs Horvát <szhorvat at gmail.com>*Date*: Fri, 15 May 2009 04:17:34 -0400 (EDT)*References*: <gugars$ekm$1@smc.vnet.net>

Emin Gahramanov wrote: > Hi guys, > sorry for the silly question (I am a Mathematica dummy). I have integrated > out an expression, and I do not know how to interpret the term like this: > (-1. g + r)^4) > What throws me off is "1. g" (g is a parameter), what is that dot after one > and there is also a SPACE after the dot and before "g" symbol. Sometimes I > get smth. like "1. r" what is that supposed to mean? If r=2, then how to > interpret the latter? Is it 1.2?? Or? Thanks. > It means -1.0*g. Avoid inexact numbers when doing symbolic calculations. Of course 1*g is just g, but in Mathematica 1.0 means 1 with a certain precision, not necessarily precisely 1. Use Rationalize to convert floating point numbers to rationals.