Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2013

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Multiplication by 0: non-zero in versions 8 and 9

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131185] Re: Multiplication by 0: non-zero in versions 8 and 9
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Sun, 16 Jun 2013 05:17:35 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
  • Delivered-to: mathgroup-outx@smc.vnet.net
  • Delivered-to: mathgroup-newsendx@smc.vnet.net
  • References: <20130615082348.A15416A72@smc.vnet.net>

Use of inexact numbers produces inexact results (which can be handled with
Rationalize or Chop). Use of exact numbers produes exact results.


Times[1.23 + I 2.45, 0] // Rationalize


0


Times[1.23 + I 2.45, 0] // Chop


0


Times[123/100 + I 245/100, 0]


0


Times[1.23 + I 2.45 // Rationalize, 0]


0



Bob Hanlon


On Sat, Jun 15, 2013 at 4:23 AM, Sotirios Bonanos <sbonano at inp.demokritos.gr
> wrote:

> Hello ,
>
> I have noticed that in all Mathematica versions <8, multiplying a real or
> complex number by the integer 0 gives 0, but in versions 8 and 9
>
> Times[0, 0.567] gives 0.
>
> and
>
> Times[1.23 + I 2.45, 0] gives 0. + 0. I
>
> I don't know what prompted this change but it is definitely wrong: the
> zero property of multiplication holds for real and complex numbers also
> (see https://en.wikipedia.org/wiki/Multiplication#Properties) .
>
> Sotirios Bonanos
> http://www.inp.demokritos.gr/~sbonano/
>
>
>



  • Prev by Date: Re: v9.0.1 lost the default settings
  • Next by Date: Re: Getting the plotted data from a graph
  • Previous by thread: Multiplication by 0: non-zero in versions 8 and 9
  • Next by thread: Re: Multiplication by 0: non-zero in versions 8 and 9