Re: Bug in Mathematica 8 vs Mathematica 7: SeriesData
- To: mathgroup at smc.vnet.net
- Subject: [mg116842] Re: Bug in Mathematica 8 vs Mathematica 7: SeriesData
- From: DrMajorBob <btreat1 at austin.rr.com>
- Date: Wed, 2 Mar 2011 04:33:57 -0500 (EST)
No such error in v8 at this machine:
SeriesData[r,Infinity,{-1,-2,-3},0,3,1]
-1-2/r-3/r^2+O[1/r]^3
$Version
"8.0 for Mac OS X x86 (64-bit) (November 6, 2010)"
HOWEVER, SeriesData objects are supposed to be generated by Series.
Generating them by hand is undocumented, so on your head be it.
Bobby
On Tue, 01 Mar 2011 04:23:24 -0600, GidiL <gidienator at gmail.com> wrote:
> Dear All!
>
> A long time ago I asked about the right way of using SeriesData for
> multiple expansions.
>
> For example, if you want a multiple expansion of a metric in general
> relativity, it is quite simple to input:
> SeriesData[r, Infinity, {-1, -2, -3}, 0, 3, 1]
> In Mathematica 7 this line is accepted as is, without any error
> messages or problems.
>
> Yet, try this in Mathematica 8. You will get the following error
> message:
> SeriesData::sdatv: "First argument 1/r is not a valid variable."
>
> Does anyone know what has changed in version 8? Why should such a
> simple expression be invalid in version 8 but be OK in version 7? I
> find it quite strange.
>
> Would appreciate any help!
>
> Cheerio,
>
> Gideon
>
--
DrMajorBob at yahoo.com