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Re: behavior from Mathematica 7 to Mathematica 8

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  • Subject: [mg114076] Re: behavior from Mathematica 7 to Mathematica 8
  • From: Vince Virgilio <blueschi at>
  • Date: Mon, 22 Nov 2010 07:41:32 -0500 (EST)
  • References: <ic8ab4$7ve$> <ic9led$nv7$>


> > On 11/19/10 at 5:10 AM, edskul... at (David Skulsky) wrote:
> > >While testing Mathematica 8 on some heritage code, I found a problem
> > >which a colleague traced to a behavioral change in Times[].
> > >Specifically, the documentation for Times[] states that "0 x
> > >evaluates to 0, but 0.0 x is left unchanged."  This appears to be
> > >true in Mathematica 7 but not in Mathematica 8 (at least not under
> > >Mac OS X 10.6.4).
> > >I have informed Wolfram about this change (bug?).


> Most importantly, Times[] is a fundamental function in Mathematica and
> extraordinary care should be taken before any changes to such
> functions are made. If changes are made, they should be properly
> documented and shouted from the rooftops because it's likely that they
> will affect a large fraction of the Mathematica community.

Apparently Mathematica 8 has a better representation of machine zero than Mathematica 7.

Pretty deep.


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