Re: Approximate Zero Times A Symbol

*To*: mathgroup at smc.vnet.net*Subject*: [mg127073] Re: Approximate Zero Times A Symbol*From*: Bob Hanlon <hanlonr357 at gmail.com>*Date*: Thu, 28 Jun 2012 04:03:03 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201206270811.EAA18698@smc.vnet.net>

Use Rationalize expr = 0. x + 1. y; expr // Rationalize y expr // Rationalize[#, 0] & y If there are any rational factors remaining you can use N with any desired precision to return to reals. Bob Hanlon On Wed, Jun 27, 2012 at 4:11 AM, djmpark <djmpark at comcast.net> wrote: > > What is the justification for the following? > > > > 0. x + 1. y > > > > 0. + 1. y > > > > I want to display a dynamic weighted sum of x and y and sometimes one of the > coefficients becomes zero. I would like to keep both terms (for a steady > display) and format with NumberForm. If Mathematica is going to drop the x, > why doesn't it at least also drop the approximate zero? > > > > If I use SetPrecision we obtain: > > > > SetPrecision[0. x + 1. y, 10] > > > > 1.000000000 y > > > > which is at least more consistent, but not what I want either. > > > > David Park > > djmpark at comcast.net > > http://home.comcast.net/~djmpark/index.html

**References**:**Approximate Zero Times A Symbol***From:*"djmpark" <djmpark@comcast.net>